Grandmas Lasagna

Ingredients

• 2 lbs ground beef
• 1 lb ground Italian sausage
• 1 large green bell pepper, diced
• 1 large onion, chopped
• 3 stalks celery, diced
• 28 ounces diced tomatoes
• 15 ounces tomato paste
• 1 tablespoon fresh minced garlic
• 1 tablespoon dried oregano
• 1 lb lasagna noodle
• 2 lbs shredded mozzarella cheese
• 2 (10 1/2 ounce) cans cream of mushroom soup
• salt
• pepper
• red pepper flakes