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This recipe was submitted by Good Food member annamc and has not been tested by our team.
Preheat the oven to 200C/fan 180C. Cook the macaroni.
Heat the oil in a pan and add the garlic and leeks and allow to soften.
Melt the butter in a pan. Stir in the flour gradually.
Add the milk gradually, stirring to avoid lumps. Add the mustard.
Add the cheese and stir the mixture until it has melted into the sauce.
Stir the leeks into the sauce. Add the cooked pasta.
Put the mixture into an oven proof dish, top with cheese and bake for 20mins.