Runner bean and tomato casserole recipe

Ingredients

• 500 g runner beans
• 1 large onion, roughly chopped
• 20 ml extra-virgin olive oil
• 2 garlic cloves, finely chopped
• 50 ml dry white wine
• 1 x 400g/14oz tin of chopped tomatoes
• 2 tbsp tomato purée
• 1 pinch caster sugar
• 250 ml vegetable stock
• 2 tbsp finely chopped parsley
• 2 spring onions, finely sliced