Lasagna With Spinach and Pepperoni without mozzarella

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[...]

1 lb fresh spinach 6 ounces dried lasagna sheets salt black pepper 2 ounces unsalted butter , melted 2 ounces Fontina cheese or 2 ounces gruyere cheese ,[...]