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1
Boil the pasta following the instructions of the package.
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2
Drain.
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3
In the meantime, put olive oil in a pot and saute the onion.
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4
When its golden, add the chorizo, chopped.
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5
Fry slightly.
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6
Add the tomato sauce, the macaroni, and mix well.
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7
Put them in a baking dish.
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8
Set aside.
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9
Now its the bechamels turn.
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10
Begin by melting the butter gently (dont overheat it or let it brown, as this will affect the colour and flavour of the sauce).
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11
As soon as the butter melts, add the flour and, over a medium heat and using a small pointed wooden spoon, stir quite vigorously to make a smooth, glossy paste.
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12
Now begin adding the milk a little at a time and stir again vigorously.
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13
When about half the milk is in, switch to a balloon whisk and start adding large amounts of milk, but always whisking briskly.
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14
Your reward will be a smooth, glossy, creamy sauce.
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15
Season with salt to taste.
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16
Preheat the oven at 200 degrees C.
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17
Pour the sauce over the macaroni, add the grated cheese and put it in the oven for 20 minutes at 200 degrees C.