How to make Vichyssoise soup - howtothings.net

Ingredients

• 50g/2oz butter
• 3 large leeks, trimmed and thinly sliced
• 1 onion, thinly sliced
• 500g/1lb 2oz potatoes, chopped
• 900ml/1 1⁄2pt vegetable stock
• 2 teaspoons lemon juice
• pinch of ground nutmeg
• 1/4 teaspoon ground coriander
• 1 bay leaf
• 1 egg yolk
• 150ml/5fl oz single cream
• salt and freshly ground black pepper