Alfajores (Argentine Caramel Sandwich Cookies)
*Test Kitchen Tip:
Dulce de leche is a caramelized milk product that's used in Hispanic cooking. Look for it in the ethnic foods section of larger supermarkets or at Hispanic food stores.
Layer unfilled cookies between waxed paper in an airtight container; cover. Store at room temperature for up to 3 days or freeze for up to 3 months. To serve, thaw cookies if frozen. Assemble sandwich cookies as directed in step 4.