Pasta Sosis

Bahan-bahan (4 porsi)

• 250 g / 0.5 lb spiral pasta ((Note 1))
• 500 g / 1 lb good Italian sausages (, or other quality sausages of choice)
• 1 tbsp olive oil
• 1 small onion (, finely chopped)
• 2 g arlic cloves (, minced)
• 800 g / 28 oz crushed tomato ((or tomato passata))
• 1 tsp chilli flakes / red pepper flakes ((adjust to taste))
• Salt and pepper
• 1 - 2 big handfuls baby spinach ((optional))
• Basil leaves (, finely sliced)
• Parmesan