Tomato sauce with tuna and ricotta

This sauce is very rich. Serve with your favorite pasta.

4 tomatoes or 1 can of diced
1/2 c. Butter
1 can tuna
1/2 cup ricotta cheese
1/4 c. Grated Parmesan
Salt and pepper to taste

If you are using fresh tomatoes, you should blanch them to remove the skin, then dice them. Over medium-low heat, melt the butter. Add the tomatoes and cook for 20 minutes. Add salt and pepper. Stir in tuna and ricotta. Pour over pasta. Add cheese on top of the pasta.