Perfect pasta alla Norma

Tomato sauce:

• 2 x 410gms tins of crushed tomatoes or tomato passata
• 2 Tbsp butter
• 1 brown onion peeled and roughly chopped into 8 pieces
• 3 cloves of garlic slices
• 1 tsp dried oregano
• ½ - 1 tsp dried chilli flakes

Rigatoni all Norma:

• 2 large aubergines brinjal or 3 medium, cut into 2-3cm dice
• 3 Tbsp olive oil
• salt & pepper
• ½ tsp dried oregano
• 250 gm rigatoni
• approx 1.5 - 2 cups of the tomato sauce as per above
• Grated ricotta salata to taste optional and I didn't use
• 1/2 cup 125gms fresh ricotta (optional but I didn't use)
• Freshly grated Pecorino or Parmesan cheese