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Melt butter in a medium sauce pan over medium heat.
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Cook butter for a few minutes until it’s foamed up and the foaming has subsided.
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Add in the flour and whisk until a smooth roux has formed.
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Cook roux for about five minutes over medium heat (stirring frequently) until roux has turned lightly brown and smells nutty.
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Whisking vigorously, pour in the milk gradually. At first the roux will turn into a paste, keep whisking and adding the rest of the milk gradually until a smooth sauce forms.
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Stud the onion halves with the four cloves and dump the onion halves in the sauce along with the bay leaves and smashed garlic cloves.
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Let the sauce come to a low simmer, stirring regularly to keep the sauce from burning.
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Simmer Bechamel sauce for 30 minutes, stirring regularly, then carefully remove bay leaves, garlic cloves and the onion halves (make sure all cloves are accounted for!).
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Grate about half a teaspoon of nutmeg into the sauce and add salt and freshly ground pepper to taste.
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Finally, add in the dry rub, Tabasco and apple cider vinegar, stir to combine and leave to simmer.