Step 1

Put the sugar, lemon juice, zest and butter in a pan on a low heat and stir with a wooden spoon until the sugar has dissolved and butter melted.

Step 2

Turn the heat up to medium and whisk in the beaten egg and keep whisking until boiling.

Step 3

Whisk for another minute (the mixture will thicken and coat the back of a wooden spoon). Thickens further on cooling.

Step 4

Pour into hot sterilized jars and seal with lids immediately.

Step 5

Allow to cool, then store in fridge and consume within 2 – 3 weeks.

Step 6

Makes approximately 300 mls (1 to 2 small jars)!