also: ルウ
roux
A mixture of fat and flour used as a base for sauces; in Japanese cooking, often refers to the roux block used for curry.
from French
curry sauce; curry roux
Colloquially refers to the pre-made curry sauce block or the resulting curry sauce itself, especially in home cooking.
Put the roux in the pot and dissolve it well.
When making curry, first you fry the roux.
If you use store-bought curry roux, you can easily make curry.
Add the roux to the soup to thicken it.
I bought curry roux at the supermarket.