Trouvere Cakes

Lay a pound of flour in a circle on the table and in the center place half a pound of butter, half a pound of sugar, the peel of one orange and two eggs, also a half-inch ball of carbonate of ammonia, having it finely crushed; mix the whole carefully to obtain a smooth and fine paste, watching attentively that it does not crumble; let it rest for half an hour, then roll it to three sixteenths of an inch in thickness; cut it into inch and a half diameter rounds with a channeled pastry cutter, range them on a baking sheet, egg over, and trace lines on top with a fork; prick the surfaces and bake in a hot oven.