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Heat oven to 200C/fan180C/gas 6. Cook the leeks in a pan of boiling salted water for 4-5 mins or until just tender. Drain and cool under a cold tap to stop them from cooking any further, then drain again well and pat dry on kitchen paper.
Wrap each leek in a slice of ham, then arrange, side-by-side, in a large baking dish. Mix the cheddar in a bowl with the Dijon mustard and crème fraîche, until well combined. Season to taste. Spread over the leeks, then bake for 15-20 mins until bubbling and golden brown. Serve at once with plenty of crusty bread to mop up the juices.
Make it with potatoes
Bake four jacket potatoes in the oven for 40 mins before cooking the leek dish. Split oven and serve the leeks on top.