1. Heat oven to 300 degrees. In a medium bowl, whisk the egg whites and salt until frothy, about 2 minutes. Add condensed milk and vanilla to egg-white mixture, and blend. Using a rubber spatula, fold in the coconut until well combined.

2. Line two baking sheets with parchment paper or Silpats (French nonstick baking mats). Using a teaspoon and your fingers, form macaroons into 1 1/4-inch mounds about 1 inch apart.

3. Bake until macaroons are golden brown, about 20 minutes. Transfer baking sheets to a cooling rack. Remove the macaroons from pan when cool, and place in decorated boxes, or store in an airtight container for up to a week.