I love these! They are a delicious sweet cookie from Argentina. They are a sandwich cookie - biscuit type cookie with Dulce De Leche in the middle then rolled in coconut. Sometimes they're called "cornstarch cookies". My mother-in-law first introduced these to me. She would make mine with crushed nuts or shaved white chocolate on the outside though as I have an allergy to coconut. Also, you can add 1 tablespoon of cognac for the traditional recipe, but I usually don't. ** You can buy Dulce de Leche in Spanish grocer or some of the larger supermarkets sell it by the condensed milk, if not, follow below... For the Dulce de Leche: Pour the two cans of condensed milk into a double boiler set over low heat. Cook milk, stirring once in a while, for 2-4 hours, until mixture thickens and becomes caramel-like. Remove from double boiler and refrigerate until needed. Mixture will firm with chilling.
- Beat the butter until creamy. Add the sugar gradually, beating until the mixture is light and fluffy. Add egg yolks, one at a time, beating well after each addition. Beat in the vanilla and lemon rind.
- Sift together the cornstarch, flour, baking powder and salt. Gradually add the dry ingredients to the butter mixture, beating until thoroughly combined.
- Drop the batter by small spoonfuls onto well buttered baking sheets. Leave enough space between the cookies because they will spread.
- Bake in a 350 degrees oven 15 minutes. Immediately remove from the baking sheets and let cool.
- When cool, spread some Dulce de leche on the bottom half of the cookies and make a sandwich with the remaining cookies. Squeeze the sandwiches so that some of the dulce de leche is squeezed out the sides, and roll the sides in the grated coconut.