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.