1/3 cup confectioner’s sugar
grated zest of 4 small key limes (or 1 regular lime)
2 tablespoons lime juice (from about 5 key limes or 1 or 2 regular limes)
2 tablespoons corn starch
2 cups minus 2 tablespoons all-purpose flour
1/4 teaspoon salt
additional confectioner’s sugar for dusting the meltaways
In an electric mixer, cream together the margarine and confectioner’s sugar. Add lime zest and juice and beat until well-combined.
In a small bowl, whisk together the cornstarch, flour and salt. With the mixer on low speed, add the flour mixture a bit at a time and beat until just combined. Chill the dough for an hour until firm.
Preheat oven to 350 F. Mound dough onto two large pieces of waxed paper, or two pieces of parchment paper. Form into logs 1-1/4 inch in diameter. Slice into coins 1/4 inch thick. Place coins onto a lightly oiled baking sheet.
Bake until cookies are barely turning golden, 12-15 minutes.
Allow to cool slightly and transfer onto a clean napkin. Dust the tops with confectioner’s sugar.