Rocky Road Fudge using the Thermapen 4 Digital Thermometer

Rocky Road Fudge - Fab Food 4 All

My last dalliance with fudge was over a year ago and was a resounding flop. I didn’t own a digital thermometer back then so when I boiled my fudge to the “soft ball” stage I was testing by hand and obviously got it completely wrong so the resulting fudge never set and was more like thick wet fondant icing – a very sorry state of affairs! So when the makers of the Thermapen 4 Digital Thermometer asked if I’d like to come up with a recipe to put it through its paces I knew exactly what I had to make – fudge! But then came the next big question, what sort of fudge should I make, the possibilities are endless. I didn’t have to wait long for inspiration as a trip up the sweet aisle in my local supermarket led me to the chocolate bars, one of which was a Rocky Road one covered in mini marshmallows plus plain and white chocolate chips!

Rocky Road Fudge - Fab Food 4 All

Which ever way you hold the Thermapen 4 up the display will be the right way up!

Back home I devised my fudge recipe which I wanted to be creamy and slightly soft ie not a crumbly so to help with this most of my marshmallows were going to be melted into the fudge along with the milk chocolate. What resulted was my kids coming in from school with the first one (my daughter) giving my Rocky Road Fudge 10 out of 10 and then my son came in and gave it 11 out of 10! So a resounding success, the only trouble is it’s so very morish, you really have to be strict with yourself (and your hubby)! This fudge would be great for handing out at a Bonfire Night Party, Halloween or wrapped in cellophane with a bow for Christmas presents.

Rocky Road Fudge - Fab Food 4 All

But how did the Thermapen 4 perform I hear you cry! Well what can I say, it’s little wonder that it’s the UK’s number 1 selling food thermometer! I had a digital thermometer which was just a stick so could never have used it for testing hot sugar but with the Thermapen 4 the design allows you to pivot the probe at an angle or fully extend it. Hence in order to keep my fingers away from the extremely hot bubbling fudge I angled the Thermapen 4 to 90º so that my hand was on the outside of the pan while the probe was quickly measuring the temperature inside the pan (3 seconds is all it takes which is super fast). Best of all the temperature reading lights up in dark conditions and flips to the correct way up which ever way you hold it (a bit like a mobile phone only it covers 4 ways up rather than just 2). I put the Thermapen 4 down without closing it back up and later went back to it worrying that I’d drained the battery. I needn’t have worried though as it has a built in sleep function and wakes up as soon as you pick it up again! And if all this wasn’t enough it’s also waterproof so getting splashed in the kitchen isn’t going to be a problem and it comes in a whole range of funky colours so you’ll never loose it! All in all I’d give the Thermapen 4 10 out of 10 as it ticks all the boxes for functionality and is incredibly user friendly.

Rocky Road Fudge - Fab Food 4 All

Would you believe that as I sit here writing this post I just looked up to see the Thermapen 4 being used on the Great British Bake Off to help with tempering chocolate!

5.0 from 9 reviews
Rocky Road Fudge using the Thermapen 4 Digital Thermometer
Prep time
Cook time
Total time
Milk chocolate and marshmallow fudge studded with biscuit pieces and decorated with more marshmallows and chocolate chips = Rocky Road Fudge!
Recipe type: Snack
Cuisine: British
Serves: 30
  • For the fudge:
  • 450 g Granulated sugar
  • 150 g Unsalted butter
  • 150 mls Semi-skimmed milk
  • 100 g Good quality milk or dark chocolate, broken up
  • 50 g Golden syrup
  • 100 g Digestive biscuits (or any other), chopped into mini marshmallow sized pieces
  • 50 g Mini marshmallows
  • For the decoration:
  • Handful plain chocolate chips
  • Handful white chocolate chips
  • Handful mini marshmallows
  1. Grease a 20 x 24.5cm tin with butter and line it with a single sheet of greased parchment allowing a few centimetres of overhang (to use as handles when removing the fudge).
  2. Place the sugar, butter, milk, chocolate and golden syrup into a large heavy based saucepan.
  3. Heat gently and stir until all the sugar has dissolved (you will hear it scratching against the bottom of the pan with your wooden spoon if it hasn't).
  4. Bring the mixture to the boil and then boil gently for 10 minutes or until it reaches the “soft ball” stage of 116ºC on your food thermometer (has to be suitable for sugar).
  5. Once this stage is reached remove the pan from the heat and set aside to cool for 5 minutes.
  6. Add the biscuit pieces and the marshmallows and beat until the mixture starts to look thick and almost grainy.
  7. Pour the fudge into the greased tin and even out the surface with a plastic spatula.
  8. Scatter mini marshmallows over the top pressing down with your hand.
  9. Then scatter the plain and white chocolate chips over the top and allow to cool.
  10. Once cool remove the fudge from the tin using the parchment “handles” and cut into even sized pieces. (I made 30 but you could make more by cutting smaller).
  11. Then store in an airtight container where it should keep for at least 2 weeks.

Rocky Road Fudge - Fab Food 4 All

Making the parchment longer than you need makes removing the fudge easy!

I asked some fellow bloggers for their recipe ideas using a thermometer:

Morello Cherry & Raspberry Jam – The Veg Space

Mississippi Mud Cake with Raspberry Italian Meringue Buttercream – Casa Costello

Rum & Sultana Fudge – United Cakedom

Damson & Redcurrant Jam – BakingQueen74

Baileys, Pistachio and Cranberry Fudge – Foodie Quine

Double Raspberry Macarons – Supergolden Bakes

As this fudge contains three types of chocolate I am entering it into this month’s We Should Cocoa where the theme is USA which is run by Tin & Thyme and hosted this month by It’s not easy being greedy.

NB: This is a commissioned post for Electronic Tempurature Instruments, all opinions are my own.




Permanent link to this article: https://www.fabfood4all.co.uk/rocky-road-fudge-using-the-thermapen-4-digital-thermometer/


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  1. Amy Fidler

    Def will try this,as love Rocky Road in our family x

    1. Camilla

      It’s so good Amy:-)

  2. A S,Edinburgh

    This looks wonderful, I bet the texture is gorgeous!

    1. Camilla

      It was the best fudge I’ve ever had:-)

  3. Heather Haigh

    That looks so delicious!

  4. Tracy

    This fudge looks utterly fabulous – thanks for entering into #WeShouldCocoa – I am very keen to give it a try myself!

    1. Camilla

      Oh do Tracy, it’s utterly amazing and deadly morish!

  5. Rosie Wilcock

    Definitely going to try this recipe as i’ve been looking for a good cookie recipe for a while, will let you know how they come out.

    1. Camilla

      This is a fudge recipe;-)

  6. Ickle Pickle

    Oh how yummy does this look! My kids love rocky road – this looks amazing. I don’t think I could master fudge making! Kaz x

    1. Camilla

      Kaz this was my 3rd ever attempt at making fudge and with a thermometer it was a walk in the park, you could definitely do this, not difficult at all:-)

  7. George Wright

    My other half would love this! I’ve repinned it for future use thanks 🙂

    1. Camilla

      Great, I’m sure he will love it:-)

  8. Maya Russell

    Never used a thermometer like this in cooking. The fudge looks superb!

    1. Camilla

      A thermometer is so useful, especially when BBQing meat etc to check it’s cooked through!

  9. Paul Wilson

    Rocky Road Fudge ftw!

    1. Camilla

      I have no idea what ftw is LOL!

  10. Jenni - Odd Socks and Lollipops

    This looks amazing, wow. I could really do with some of that right now!

    1. Camilla

      It was totally amazing, whole family went nuts over it:-)

  11. Rachel

    Oh my! These look amazing! I love rocky road fudge, but mine never turns out like this x

    1. Camilla

      Thanks Rachel, well you’ll have to try this recipe then:-)

  12. charlotte

    This looks really yummy! I have a thermometer from when I made blue candy to use as Elsa’s ice castle. I will have to try this. x

    1. Camilla

      Thank you Charlotte, I bet your Elsa cake looked amazing:-) A good thermometer is so important.

  13. Claire

    Oh wow! These look amazing! I love rocky road fudge 🙂 I’m definitely trying this recipe x

    1. Camilla

      Great Claire, your nearest and dearest will love you for it:-)

  14. Tori Gabriel

    I can never manage fudge, it’s too difficult for me. Maybe I should try it with the thermometer as it seemed to help you. x

    1. Camilla

      It’s all about the right temperature so you’d be fine with a thermometer:-)

  15. Sarah Bailey

    Oh my goodness this sounds amazing – I have to admit I have a soft spot for Rocky Road. x

    1. Camilla

      Thanks Sarah, it didn’t last long here:-)

  16. You Baby Me Mummy

    This looks totally fabulous. I can see it in masons jars for Christmas x

    1. Camilla

      Thanks, yes that would look so pretty:-) My usual trick is a small roasting bag trimmed to size tied with a ribbon:-)

  17. Kim Carberry

    Goodness me! That looks amazing! Such a treat x

    1. Camilla

      Thank Kim, the ultimate treat;-)

  18. Cathy Glynn

    Oh my Camilla this looks like heaven, I will definitely have to make these and very soon. x

    1. Camilla

      Excellent Cathy, I hope they last longer in your house than they did here LOL;-)

  19. Debi @ Life Currents

    I’ve never been able to get old fashioned fudge to work for me. You totally nailed it! This looks awesome!

    1. Camilla

      Thanks Debi – all you need is a fab thermometer:-)

  20. Rosana @ Hot&CHilli Food and Travel Blog

    Rocky Roads are so much fun with fudge even better! so naughty Your recipe looks fab! R

    1. Camilla

      Thanks Rosana, they were a huge hit here;-)

  21. Katie Bryson

    What a fun recipe Camilla… I can’t even imagine the sugar rush that would be the result, but I know my boys would LOVE it!!!!

    1. Camilla

      I’m sure they would love it like mine. Hubby just pronounced that it was the best home made fudge he’d ever had so I’m a happy bunny all round;-)

  22. Martina Evans

    I’m having a sugar overload by just looking at these photos of your delicious creation. I would like to make my own for my family. Thank you for the recipe x

    1. Camilla

      Excellent Martina, do let me know how you get on:-)

  23. christine

    This looks heavenly. Thanks for letting me know about this thermometer- I really need to get something like this.

    1. Camilla

      Thanks Christine, it’s just too heavenly LOL! Yes I couldn’t recommend a better one;-)

  24. Lucy @ BakingQueen74

    excellent recipe, must try fudge at home as handily I also have a Thermapen!

    1. Camilla

      Thanks Lucy, excellent such a great gadget:-)

  25. Roz

    I think I could do with one of these! that fudge looks gorgeous!

    1. Camilla

      Thanks Roz, yes so many things I want to make, macarons are next on the list:-)

  26. Anne

    Oh oh oh Camilla you are spoiling us!

    I love rocky road… and I love fudge, together looks and sounds a lot like heaven!!

    1. Camilla

      LOL Anne, this is definitely a recipe for you then:-)

  27. peter @feedyoursoultoo

    The recipe looks delicious and having a really good thermometer for baking can be so important. Thx for sharing.

    1. Camilla

      Thanks Peter, the fudge has been a huge hit here as well as the thermometer;-)

  28. kate @veggie desserts

    Oooh, that thermapen sounds great. Candy can be such a faff, but this looks so useful to make it easier. And the rocky road bars sound goooooood!

    1. Camilla

      It really is a genius product Kate. The fudge is a winner too:-)

  29. Kate | The Veg Space

    Gorgeous! That looks rather naughty but nice. I’ve just heard about some great veggie/vegan marshmallows so know what I’ll be using them on now! I’ve just recently got a proper digital thermometer and wish I had bought one ages ago, they are so handy!

    1. Camilla

      Thanks Kate they are very naughty but very nice:-) I’ve had 2 digital thermometers before, one very simple small one not suitable for sugar and the other so complicated that it never got used!

  30. Sally - My Custard Pie

    I would never have thought of using a digital thermometer for fudge. On my Christmas list.

    1. Camilla

      I made fudge as a kid with condensed milk which didn’t need a thermometer so maybe it depends on the recipe.

  31. Jacqueline Meldrum

    This looks like a really naughty treat Camilla. Who could resist? What a handy thermometer to have in the kitchen.

    1. Camilla

      Thanks Jacs:-) Tell me about it, it’s taking much self control to not eat too much of it!

  32. Helen at Casa Costello

    Wow this fudge looks incredible – My last attempt at fudge making was a soggy mess too. Really put me off. That thermometer looks just the ticket – Mine is a old relic that just about manages to reach high temperatures. Thanks so much for the mention x

    1. Camilla

      Thanks Helen:-) Glad I’m not the only fudge failure in town! No more failures for me now with the Thermapen thank goodness:-)

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