Ingredients:
450g leeks, sliced and finely chopped
30g butter
freshly-grated zest of 1 orange
6 tsp orange juice
salt and black pepper, to taste
3 tbsp flour
360ml milk
2 tbsp lemon juice
Method:
Melt the butter in a large saucepan and use to fry the leeks for 2 minutes before adding the lemon juice and seasoning to taste. Secure the lid and allow the mixture to sweat gently for about 5 minutes, or until tender.
Add the flour to the mixture and stir in thoroughly before adding the orange zest. Stir to combine then gradually add the milk, stirring all the while. Bring the mixture to a boil then reduce to a simmer, allowing it to cook for 5 minutes more. Add the lemon juice and serve hot.