Combine flour, cornmeal, salt, egg and water in a large bowl, then beat.
Spoon 3 cups of batter onto a moderately hot ungreased griddle, flattening with
the bottom side of a spoon to make thin (1/4-inch) pancake. Turn tortilla when edges
become dry, but not browned, and cook on other side. Set aside.
To complete meal, brown ground beef.
Reheat tortillas on a hot griddle with oil until lightly browned.
Place a portion of tomato, onion, bell pepper, cheese and lettuce on top of each
tortilla; roll and enjoy!