
Vegetable shortening, for greasing
¾ cup unsalted butter
¼ cup sugar
½ teaspoon salt
2 cups finely crushed graham crackers
2 cups dark chocolate chips
1 (14-ounce) can sweetened condensed milk
1 tablespoon Baileys Irish Cream liqueur, optional
¾ cup sugar
½ cup light corn syrup
¼ cup water
¼ teasoon salt
2 pasteurized liquid egg whites
¼ teaspoon cream of tartar
2 teaspoons vanilla extract