Baked Beefy Tomato Rigatoni

• 1 onion l
• 525 gr tomatoes (crushed)
• 475 gr rump roast (shredded)
• 220 gr mozzarella cheese (shredded)
• 200 gr pasta rigatoni
• 120 gr provolone cheese (shredded)
• 16 ml olive oil
• 1 gr salt
• 1 gr pepper flakes (red)