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Boil the pasta in salted water until al dente. Drain and set aside.
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Mix the shredded cheeses.
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Heat the butter in a large skillet.
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Whisk in the flour.
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Add the flour and whisk for 1 to 2 minutes until the lumps dissolve.
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Stream in the milk whisking consistently. Whisk until smooth, with no lumps.
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Reduce heat and simmer until it thickens, stirring frequently.
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Stir in 3/4 of the cheese until melted.
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Stir in the preserved lemon juice.
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Season with salt and pepper to taste
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Preheat the oven to 400F.
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Grease a large baking dish.
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Toss the pasta in the sauce.
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Mix in the preserved lemon pieces, then the dill
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Transfer the mixture to the baking dish.
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Sprinkle the rest of the remaining cheese and then the chopped 1/2 preserved lemon over the top.
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Bake for 20 minutes, until golden and bubbly on the top.
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Remove from oven and serve.