This is all adjusted to taste and subject to trial and error!
2 28 ounce can of tomatoes - I prefer the ones we can fresh from the garden but the whole peeled tomatoes work just fine. I would not buy the petite chopped tomatoes but coarsely chop the whole peeled ones.
Add salt and pepper to taste and a pinch of sugar ( D used 1 tablespoon ) to cut down on the acid. Naturally, I add butter to flavor the gravy. Adjust to your taste or diet. ( D used 1 tablespoon).
Cook the tomatoes down until about half the liquid is gone. Mix about a cup of milk and flour ( I cheat and use the wondra flour about 1 to 2 tablespoons) and pour into tomatoes.
Stir until desired consistency and pour over biscuits!