I'm not really a dessert person but this was rather nice! Kids liked it too.
Juice and grated rind of 3 lemons (I did cheat as I didn't have real lemons and just used 6 tablespoons of lemon juice)
6 tablespoons sweetener
1 tub quark
In a heatproof bowl mix your lemon juice, rind and sweetener. Beat in the eggs. Boil a small pan of water and sit your bowl on top. Heat and mix until it thickens (custard like consistency) - this took me about 30 minutes. Then add quark tablespoon at a time and mix. Divide between ramekins and chill. Enjoy :)