Lasagna With Italian Sausage and Spinach without eggs

2 (14 1/2 ounce) cans diced tomatoes 2 (14 1/2 ounce) cans crushed tomatoes 1 cup white onion, diced 3 tablespoons fresh basil , chopped 2 teaspoons dried[...]

12 ounces dried lasagna noodles, cooked in boiling water 3 tablespoons oil 1 onion , diced 1/2 green bell pepper , diced 1 lb mild Italian sausage , casings[...]