Alfajores come in many sizes and flavors. Each region of south america has its own version. We like alfajores best when they are freshly made so that the crisp cookies contrast the soft filling, but many people prefer to wait a couple of days for the cookies to soften so that the cookie and the filling have the same texture. This traditional recipe calls for a touch of pisco, a south american brandy, in the cookie dough. It's optional but adds a nice flavor. You can substitute any brandy for the pisco. For an extra special cookie, make your own dulce de leche.