Cooking is your friend. (normal ketchup being full of sugar, is not). Here's a simple recipe:
Philly Cheese Plate
1 Pound Hamburger (or thin sliced rib-eye from the meat counter)
Â½ Green Pepper
1 Small Can Sliced Olives
2 Tablespoons Mustard
2 Thick Slices Pepperjack Cheese
Brown the hamburger. Chop mushrooms, onions, green pepper, and tomato. Cut cheese into thin strips. Mix all ingredients except mustard/cheese in a large pan, and cook on medium heat till the vegetables are starting to soften a bit. Cover with cheese and cook till it melts. BE CAREFUL NOT TO OVERCOOK THE VEGETABLES you don't want them getting all limp and soggy.
When done, put some on a plate and add some mustard. Should be just like a philly cheese steak sandwhich without the bread. You may want to drain the ingredients before putting them on your plate, they sometimes get a bit wet.