In a mixing bowl, combine the flour, cornmeal, baking powder, salt, sugar and dry mustard. Mix well. Gradually stir in the oil, milk and egg. Batter should be smooth and quite thick. Let stand at least 15 minutes before using.
In boiling water put hot dogs, with a skewer in them, to cook until heated through. remove and dry with a paper towel. Roll the hot dog in the cornmeal and fry. Cook in deep fat at 375 degrees until golden brown.
Variations: Use the small cocktail sausages and skip the stick. What a treat for those appetizer parties.