Classic Pepperoni-topped Lasagna

Ingredients

• 1 onion(s)
• 3 of garlic cloves
• 15 vegetable oil mL
• 454 lean ground beef g
• 1 diced bell pepper (color or green)
• 1 sliced mushrooms package
• 2 celery stalks
• 2 cans crushed tomatoes 796 mL
• 60 Tomato paste mL
• 10 dried basil mL
• 10 dried oregano mL
• 7.5 salt mL
• 2 bay leaves
• 2 crushed red pepper flakes mL
• 12 lasagna noodles
• 225 pepperoni g
• 625 grated mozzarella cheese mL