Sterilise jars by washing in hot soapy water (or take straight from dishwasher), fill with boiling water, empty and then place in oven for 20 minutes at 140°C where you leave them until the curd is ready. Washed lids should be sterilised with boiling water and then left to drain. If you don’t have a power blender then follow the instructions in my Granny’s Quick Lemon Curd post (see link above).