Work 1/2 cupful of raisins and 1/2 cupful of chopped nut meats into half of the brioche mixture. Shape into balls about the size of a walnut, and then place close together in a buttered pan. Brush over the top with 1 tablespoonful of sugar dissolved in 2 tablespoonfuls of milk. Bake in a moderate oven for about 25 minutes. Brush a second time with the sugar-and-milk mixture and allow the buns to remain in the oven until they are well browned.