1 3-oz package lime-flavored gelatin
1⅓ cups granulated sugar
2 cups sifted all-purpose flour
½ tsp salt
1 tsp baking powder
1 tsp baking soda
5 large eggs, slightly beaten
1½ cups vegetable oil
¾ cup orange juice
1 Tbsp lemon juice
½ tsp vanilla extract
½ cup Key lime juice (from about 25 small Key limes or 4 large regular limes)
½ cup confectioners’ sugar