Mum's sausage and beans

Ingredients

• 6 sausages (Mum used pork and fennel)
• 1 tbsp olive oil
• 3 red onions, sliced
• 1 or 2 chilli peppers (spice level as per your taste), diced
• 3 ripe tomatoes, chopped
• 1 tin of borlotti or pinto beans, drained
• Salt and pepper, to taste
• Parmesan cheese, grated, to serve
• Parsley, chopped, to serve