Thickeners
Rue
a rue is en equal mixture of fat (butter) and flour. You melt the butter first, add the flour and stir it to keep if from getting lumpy. Then you add your milk/liquid to the rue and go from there. It is used to thicken sauces. It's like 3 tblsp butter, 3 tblsp flour for a normal size sauce pan.
Slurry
a mixture of cornstarch and liquid*, used to thicken sauces
or
a mixture of flour and liquid*, used to thicken sauces
*could be water, milk, stock, etc
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