In another pan heat 6 TB butter. Add 1/2 cup flour. Cook together for about 2 minutes while whisking.
Slowly add the hot milk.
Add TB salt.
1/2 tsp pepper
1/2 tsp nutmeg (optional)
12 oz gruyere, shredded
8 oz good cheddar, shredded
Add cheese to sauce. Combine with 1 lb macaroni for mac and cheese.
optional: put in dish and add sliced tomatoes and bread crumbs to top. Bake at 375 for 30 min.