Keep the screen awake with cook mode on the Good Food app.
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Method
step 1
Heat the oil in a medium pan and saute the leeks for 4 mins until soft. Add the ham and potatoes and saute until heated through. Transfer to a gratin dish add the ham and keep warm.
step 2
Bring a large pan of salted water to the boil add the bellaverde spears and cook uncovered for 3 mins. Drain well and add to the gratin dish.
step 3
Add the milk to the pan, along with the butter and flour and place over a medium heat. Bring to the boil, whisking with a balloon whisk until a smooth sauce forms. Simmer for 1 min stirring to prevent it sticking. Stir in 50g of the cheese, the mustard and when smooth remove from the heat. Season to taste.
step 4
Pour the sauce over the vegetables and ham to coat it evenly.
step 5
Mix the cheese and breadcrumbs together and scatter over the sauce coated vegetables. Pop the dish under the grill and cook for a few minutes until the top is golden and crisp. Serve hot.