step 1
Microwave the butter - or alternatively if you have butter at room temperature already, this will be fine. This is only in view of speeding up the heating process, it doesnt affect the flavour if you chose to use cold butter!
step 2
Put the sugar, rind, butter and beaten egg into a large basin on top of a pan of simmering water (high heat).
step 3
Stir with a wooden spoon until thick (curd coats the back of spoon and liquid is clear). This will take approx. 30 mins.
step 4
Pour into warm, sterile jars; seal & label.