Pumpkin soup

1 large orange pumpkin, weighing 1kg, cut into chunks

1 medium onion, finely chopped

Small bunch of spring onions, finely chopped

1 garlic clove, crushed

3-4 celery leaves, finely chopped

85g butter

1.6 l stock

350ml single cream

1 tbsp chopped parsley

225g croutons

Salt and pepper