Alfajores are a kind of South American cookie popular in Peru and Argentina. This version has a touch of almond in the crisp butter cookies that sandwich the caramel filling (dulce de leche). Dulce de leche can be found at most Latin markets and on the international aisle of well-stocked grocery stores. Found in The Washington Post & saving for rainy Saturday Christmas baking this weekend. Prep time does not include a minimum 1 hour chill time. The cookie dough can be refrigerated for 1 week. If the dough is thoroughly chilled, allow it to sit at room temperature for 15 minutes before rolling it out. The unfilled baked cookies can be stored in an airtight container at room temperature for 3 days. Filled cookies are best eaten day the same day they are assembled, but can be kept at room temperature for 2 days.