Stew onion in butter for about 30 minutes, without browning.
 
 Preheat oven to 400F.  Add the eggs, seasoning and milk to the flour, whisk
 until smooth, and stir in the onion.
 
 Pour onion mixture into well-oiled baking dish and bake 20 - 25 minutes,
 until puffed-up and browned.