Mandelschnitten is a popular German almond cookie, with a lot of different variations. In researching it I did not find any others that called for Citron. I also realized I don’t know what Citron is. The doughnut recipe seems deliciously simple and so if you can’t find Citron I suggest starting with that.
Mandelschnitten 1/2 lb chopped Almonds 1/2 " Citron 4 Eggs 1 lb of Powder Sugar 2 or 3 teaspoons Cinnamon 2 " " " Cloves 2 teaspoons Baking Powder flour to stiffen bake in a Moderate oven Doughnuts 1 tablespoon butter (even full) 1 cup sugar 1 egg. 1 cup Buttermilk 1/2 teaspoon soda dissolved in Buttermilk teaspoon vanilla flour to stiffen and fry in a pan of lard.