The butter and the lard beating sugar, 1 egg yolk and add the oil in a thin stream, without stopping beating. Add yogurt with soda and juice and lemon peel. Add flour, enough to make soft dough. Divide it into three balls. Roll out the first 0.5 cm thick, cut into squares, put in the middle jam of your choice and wrap the cigar. The second ball make small balls in the middle of putting a piece of walnut. Oval them in crushed walnuts. A third ball of dough do topcheteta as walnut. Repay them to become elongated, dip them in white and roll in chopped almonds. Bake in a moderate temperature - 180 C to pale pink. Warm sprinkle with powdered sugar.