1. Preheat oven to 180C/350F/gas mark 4. Gently simmer the leeks in milk for 810 minutes, then strain, reserving the milk.
2. Liberally grease a flan dish with butter. Line with the pastry, and spoon in the leeks and cheese, in alternate layers, finishing with a sprinkling of cheese.
3. Beat the eggs and reserved milk together, and add a little nutmeg and pepper. Pour in the dish, and bake for 40 minutes, until just set. Serve warm.
Tom Bissells wine recommendation
An Alsace wine is the perfect choice to serve with the leek tart, which has some affinity with the onion tarts of that region. Choose a light and fresh Sylvaner, or the more heady and fragrant Tokay.