Family name of the chefs Albert, Michel Sr, Michel Jr, Alain and Emily (4)

I believe the answer is:

roux

(Other definitions for roux that I've seen before include "Mixture of flour and fat for cooking" , "Thickener for sauces" , "Mixture of fat and flour used as a base for sauces" , "Cook's thickening" , "Fat, flour sauce base" .)

I've seen this clue in The Times.

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