Mock turtle soup

Ingredients

• 50 g butter
• 2 large potatoes, cut into chunks
• 1 large onion, chopped
• 2 bunches watercress, plus extra to garnish
• 1.2 litres vegetable stock
• 1/2 tbsp fresh thyme leaves
• Sprig of fresh mint, chopped
• 150 ml single cream

Method

1. Melt the butter in a large saucepan. Add the potatoes, onion and watercress and cook gently for about 15 minutes, until softened.
2. Pour in the vegetable stock, season and simmer for 20 minutes.
3. Let the soup cool enough to blend safely, then process it until smooth.
4. Return the soup to the saucepan, reheat it thoroughly and stir in the thyme, mint and single cream. Garnish with the reserved watercress and serve.