Step 1
Using a fine grater, grate the zest from the lemons into a medium bowl. Squeeze and strain the juice and keep to one side.
Step 2
Put the gelatine in a small bowl and mix with the lemon juice. Allow to “sponge” (swell) for 10 mins.
Step 3
Meanwhile, add the yolks and sugar to the lemon zest and whisk until light and pale-lemon coloured.
Step 4
Set the bowl of sponged gelatine in a pan of simmering water and leave until melted and clear. Stir into the yolk mixture.
Step 5
Beat the Quark (with the Limoncello, if using) until smooth. Then fold the egg yolk mixture into it.
Step 6
Now whisk the egg whites to soft peaks and gently fold into the mix. Pour into a pretty dish or individual glass bowls. Level the surface and chill overnight or for 3-6 hours.
Step 7
Serve decorated with extra Quark and chopped lemon zest.
Enjoy!