Meanwhile, separate dough into 8 biscuits. Place 2 1/2 inches apart on sprayed cookie sheet. With bottom of flat 2-inch diameter glass or with fingers, press out each biscuit to form 3 1/2-inch round with 1/4-inch rim around outside edge. In small bowl, combine egg yolk and water; beat well. Brush over tops and sides of biscuits. Sprinkle each with sesame seed.