Melt the butter and chocolate in the top of a double boiler. Combine with egg and rest of ingredients. Drop by scant teaspoonfuls on greased cookie sheets. The finished cookies will be 3 to 10 cm in diameter so space them accordingly. Bake in preheated oven of 160ºC for about dozen minutes. Watch carefully to prevent burning. When nearly cool, remove from the cookie sheet with spatuala. (I use the metal type.Hint-press under the cookie with pressure against the sheet and they remove easily without crumbling) Place on racks to cool completely.