1In a large saucepan, bring the water, butter and salt to a boil over medium heat. Add flour all at once and stir until a smooth ball forms. Remove from the heat; let stand for 5 minutes. Add eggs, one at a time, beating well after each addition. Continue beating until mixture is smooth and shiny.
Drop by 1/4 cupfuls 3 in. apart onto greased baking sheets. Combine milk and egg yolk; brush over puffs. Bake at 400° for 30-35 minutes or until golden brown. Remove to wire racks. Immediately cut a slit in each for steam to escape; coo