BOUGATSA - GREEK CUSTARD FILLED PASTRY 1 cup fine semolina or cream of wheat 1 1/2 cups sugar 5 eggs 6 cups whole milk 1 vanilla bean or 1 ½ teaspoons of vanilla extract zest of 1 lemon 20 sheets of phyllo pastry (half of a 1 lb. package of dough) 3/4 - 1 cup melted butt