The trick with these green soups is not to add the greens until the last minute, otherwise they will overcook and the soup will lose its fresh taste and bright green colour.

50g (2oz/1/2 stick) butter

110g (4oz/1 cup) onion, chopped

150g (5oz/1 cup) potatoes, chopped

600ml (1 pint/2 1/2 cups) homemade chicken stock, vegetable stock or water

425-600ml (3/4-1 pint/2 – 2 1/2 cups) creamy milk (1/4 cream and 3/4 milk)

salt and freshly ground pepper

225-350g (8-12oz/3 cups) sea spinach, destalked and chopped

Freshly ground nutmeg

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Garnish

2 tablespoons (2 American tablespoons + 2 teaspoons) whipped cream (optional

Freshly chopped parsley

Melt the butter in a heavy-bottomed saucepan. When it foams add the onions and potatoes and turn them until well coated. Sprinkle with salt and freshly ground pepper. Cover and sweat on a gentle heat for 10 minutes. Add the boiling stock and milk, bring back to the boil and simmer until the potatoes and onions are fully cooked. Add the sea spinach and boil with the lid off for about 3-5 minutes, until the sea spinach is tender. Do not overcook or the soup will lose its fresh green colour.

Liquidise and taste and add some freshly grated nutmeg.  Serve in warm bowls garnished with a blob of whipped cream and some chopped parsley