Three-cheese ziti pasta bake

Ingredients

• 2 tbsp olive oil
• 1 large onion, finely chopped
• 4 garlic cloves, finely chopped
• 800g (2 cans) diced tomato
• 1 tsp salt
• ½ tsp ground black pepper
• ¼ tsp dried oregano
• 1 cup roasted capsicum, thinly sliced
• 200g mild cacciatore salami, thinly sliced
• ½ cup pitted kalamata olives
• 750g ziti or penne pasta
• 300g ricotta cheese
• 300g buffalo mozzarella cheese, thinly sliced
• 100g grated parmesan cheese