Columbus' Quincentennial (500 Years) Macaroni and Cheese

Yield:	4 Servings
Categories:	Pasta, Meatless

8	oz	Elbow Macaroni, uncooked
2		Ripe tomatoes; sliced
2	tb	Butter or margarine
1	tb	Flour
1/4	ts	Dry mustard
1/2	ts	Salt
2	c	Skim milk
2	c	Grated hard cheese (such as Cheddar)
1/2	c	Fresh bread crumbs