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Preheat the grill to 180°c and set for two zone cooking.
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Place the Lardons over direct heat in a pan and turn occasionally until crispy and brown all over. Set aside and retain the bacon fat for later!
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Remove and allow to rest whilst preparing the pasta.
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Boil pasta until just al dente, drain, rinse under cold water, toss with a splash of oil, and set aside.
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Place a saucepan on the grill over direct heat or side burner, add the butter and melt, stir in flour to form a roux, then slowly whisk in milk until smooth, simmering until thickened. Remove from heat, stir in cheddar, mustard, and season to taste.
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Build the pie: layer in the thick glossy mac and cheese then top with the layer of crispy lardons.
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Mix breadcrumbs with the bacon fat in a bowl then layer on top of the lardons.
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Place on indirect heat and close the lid to bake for for 15–20 minutes, until bubbling and golden.
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Remove, and enjoy!