3 limes 1 tablespoon water 1 ½ teaspoon refrigerated or frozen egg product, thawed 2 tablespoon sugar

Pretzel Crust

Nonstick spray coating   ⅓ cup butter   3 tablespoon sugar   3 ½ cup pretzels, coarsely crushed into 1/8- to 1/4-inch pieces (1-1/4 cups crushed)   1  egg white (optional)