Heat oven to 375°F. Line 15x10x1-inch pan with foil; generously grease. In large bowl, beat eggs with electric mixer on high speed about 5 minutes until thick and lemon colored. Gradually beat in granulated sugar. Beat in water and 1 teaspoon liqueur on low speed. Gradually add flour, 1/4 cup cocoa, the baking powder and salt, beating just until batter is smooth. Pour into pan.