Preheat the oven to 325 degrees F. Line 2 cookie sheets with parchment paper or silicone baking mats.
Process the almond paste, confectioners' sugar and salt together in a food processor until crumbly. Add the egg whites and continue to process into a smooth dough.
Roughly chop the pignolis and place them in a bowl. Roll tablespoon-sized pieces of the dough into balls, then roll in the chopped pignolis to loosely coat. Arrange on the prepared cookie sheets 3 inches apart. Bake 20 minutes, then remove to wire racks to cool. Cookies will last about 2 weeks in an airtight container.