This is easy. Just whip the sugar and eggs together until they are smooth. I used my food mixer for ease. Then it was just a case of stirring in lemon juice, zest and butter.

Cook in the microwave for one minute at a time and take it out to stir at the end of each minute.

When the mix is thickening and leaves a good coating on your spoon after stirring, it's ready. This could take longer than 5 - 10 minutes if you have a lower wattage microwave.

Pour into jars to set, pop into the fridge and enjoy.