Put graham crackers in a processor until they are crumbs. Add melted butter, mix briefly, then press into a 25cm flan dish. Chill until firm.

In a bowl beat eggs lightly with the quark. Add the sugar, honey and lemon rind. Pour into the crust and sprinkle generously with cinnamon.

Bake in a preheated oven for 50 minutes at 180 Celsius, or until firm.

Serve at room temperature or chilled.