Egg and Prawn Open Sandwich with Lemon Mayonnaise is a classic Danish smørrebrød. White toast is topped with lettuce, a halved boiled egg, lemon mayonnaise, fresh prawns and garnished with a twist of lemon.

Being half Danish, I regularly put together Danish open sandwiches (smørrebrød) on traditional wholegrain rye bread, but am aware it’s not to everyone’s taste.
So when my mother told me about this particular Egg and Prawn open sandwich that she makes regularly, I thought it would be ideal to share during British Sandwich Week.
The sandwich is made on crisp white toast, which contrasts well with the soft egg and prawns that adorn it. It would also go really well with toasted Easy Slow Cooker Sourdough Sandwich Bread.
It’s simple to make and great for a bite to eat at lunch time. The important aspect of this sandwich is that all the ingredients are completely dry, so no soggy lettuce or prawns, please!
Did you know that “open sandwiches” date back to the Middle Ages, when thick slabs of coarse bread (called tranches by the French & trenches by the British) were used as plates.
When the diner had finished his meal, he would either eat the trencher, feed it to his dog or save it for a beggar!
So the open sandwich really came about because of the need for a disposable plate!

I think the beauty of open sandwiches is that you get a far better ratio of nutritious topping to the bread – there’s only so much filling you can put in a sandwich, but open sandwiches can be piled high!
I also think they make you eat more slowly, as you have to use a knife and fork, and consequently you must burn more calories (well, there’s that cutting action)!
Open sandwiches are definitely the healthier option, so what are you waiting for? Go and thaw some prawns and start boiling an egg!

More Sandwich Fillings & Toppings
Check out the following sandwich ideas, too:
- Healthy Egg Salad with Greek Yogurt & Dill (No Mayo)
- Ploughman’s Open Sandwich
- Micro Quail Egg & Smoked Ham Danish Open Sandwich
- Avocado Stuffed French Toast with Poached Egg
- Quick Homemade Hummus
- Garlic Mussels on Toast
- Polish Zapianka Open Sandwich
Leave a comment and rating below when you’ve made this recipe; I love getting your feedback! You can also share your pictures by tagging @FabFood4All over on Instagram.
Egg & Prawn Open Sandwich with Lemon Mayonnaise
Ingredients
- 1 Slice white buttered toast
- 2 Lettuce leaves or enough to cover the toast
- 1 Hard boiled egg halved
- 50 g Frozen prawns thawed & patted dry with kitchen paper
- 1 tbsp Mayonnaise
- Good squeeze of lemon juice
- A few drops of milk
- 1 Slice of lemon cut from the middle to outer edge
Instructions
- Cover buttered toast with lettuce.
- Place egg halves on lettuce, side by side.
- Mix mayonnaise with a good squeeze of lemon juice and a few drops of milk to make the dressing.
- Spoon the dressing over egg halves, covering completely.
- Scatter the prawns over the top.
- Garnish with a twisted slice of lemon.
- Squeeze lemon slice over prawns just before eating.

Leila Benhamida
Nice and simple. Love a salad with eggs as it is really feeling.
Camilla
Thanks Leila:-)
Wendy
Looks delicious – really like a little nordic twist to food 🙂
Camilla
Thanks, it is really lush:-)
Alica
Oooh these look amazing!
Ursula Hunt
Nearly summer time again and picnics!
Paul Wilson
A classic with a twist, I like it.
David C
Sometime basic simple method is the best way to do! Yummy 😛
Anne Dalzell
Thought i’d stick with the sandwich theme today. My sandwiches look so boring by comparison
Camilla
Well now you know how to give them a make-over Anne:-)
Margot @ Coffee & Vanilla
I don’t really eat prawns but lemon mayonnaise always taste good with seafood… must try to make it sometimes myself, thanks for sharing this! 🙂
bev
It certainly looks more attractive than a normal sandwich!
Geoff Clark
It looks great, perfect for a summer’s day
Heather Haigh
Sounds like a lovely, light, summery dish.
glenn hutton
Visually, that looks perfection… Love prawns, not the cheap ones though which today, are tasteless.
Camilla
Aah, thanks Glenn and you’re right some prawn just aren’t sweet and delicious!
Bev
Looks really tasty – yummy!
Judith Luscombe
This looks delicious, prawns are my favourite snack.
Camilla
Thank you, it is a winner:-)
Ursula Hunt
This picture always makes me hungry
Camilla
Thank you:-)
Paul Wilson
I love anything with prawns.
Tracy Sinclair
I love prawns and egg and this looks so delicious, so much nicer than a sandwich, which, I agree can be quite soggy. I’ve got all the ingredients so thats lunch for me tomorrow, thankyou
Camilla
Enjoy:-)
Stephanie Coals
So easy yet so tasty! Looks delicious and such a light lunch
jannette roden
Prawn sandwiches are my favourite I will definitely be trying this out x
Camilla
I’m sure you’ll love it then:-)
Ursula Hunt
lunch today sorted x
Camilla
Fab, hope you enjoyed it Ursula:-)
Maya Russell
A much more elegant way to eat a sandwich.
Camilla
Yes, there’s that too:-)
Ursula Hunt
Gorgeous sandwich for a hot summers day
Camilla
Perfect:-)
Miss. Lucinda Fountain
I have never herd of an ‘Open Sandwich’ before! It sounds really scrummy & i love prawn coctail and so this would be an ideal alternative…perfect for summer.
Your recipies are truly inspiring! x
Camilla
Have Danish open sandwiches passed you by? I must do some more then:-)