1/2 onion, chopped
- Preheat oven to 375 degrees F
- Bring a large pot of water to a boil and add cauliflower. Cook for 3 minutes. Remove from heat, drain and set aside.
- Meanwhile, heat olive oil in a large skillet over medium heat. Add onion and cook until soft. Add garlic, red pepper flakes, ground beef, salt and pepper and cook until beef is browned.
- Stir in tomato paste, oregano and spaghetti sauce. Reduce heat to medium low and simmer for 15 minutes covered. Remove from heat.
- Pour cooked cauliflower into meat sauce (if pan is big enough) and stir to combine.
- In a 9x13 baking dish, create layers by spreading half of the cauliflower/meat mixture on bottom. Layer next with half the ricotta, mozzarella and Parmesan cheeses.
- Add the rest of the cauliflower/meat mixture and top with remaining cheese.
- Bake for 25 minutes.
