Kielbasa Casserole

Ingredients

• 1 large green bell pepper, cut into 1/2-inch pieces
• 1 large sweet onion, cut into 1/2-inch pieces
• 1 lb kielbasa, cut into thin diagonal slices
• 1 (28 ounce) can stewed tomatoes
• 1 cup converted white rice, uncooked
• butter, to taste