Beat eggs until frothy. Gradually beat in flour until smooth. Add milk, butter and salt and blend well. Pour batter into well-greased 9-inch glass pie plate or divide among 3 well-greased 4-inch glass baking dishes. Bake at 425? 15 minutes, then reduce heat to 350? and bake until puff is golden brown, 10 to 15 minutes longer for large puff or 5 to 10 minutes for smaller ones. Remove from oven to rack and cool in pie plate away from draft. Puff will fall in center, forming bowl as it cools. When used to serve salads, pastry bowl should be completely cooled. When used for hot fillings, serve warm. Variations: Flavor basic batter with any of the following: Add 1/4 cup shredded Cheddar cheese Add 1/4 cup chopped fresh basil Add 1 teaspoon fresh dill weed Add 1 teaspoon Chinese 5-spice powder Add 1 tbs chopped onion and 1 tablespoon canned diced green chile