What does rouille mean?
A rouille is a thick, intensely flavoured condiment made primarily from garlic and mustard, usually emulsified with oil and enlivened with chili or other spices. Its assertive aroma and sharp, spicy flavour complement fish, prawns, shellfish, grilled meats, and vegetables, and it is often served alongside rather than incorporated into a dish. The term is borrowed directly from French, where it belongs to formal culinary vocabulary. In English, rouille is less common than ketchup, mustard, or mayonnaise but is especially useful when describing a distinctly garlicky, chilli-flecked sauce. A rouille should not be confused with a roux: although both can contribute to sauces, rouille is a ready-made condiment, while a roux is a flour-and-fat mixture whose primary purpose is thickening.
nounA thick, strongly flavoured sauce made chiefly from garlic, mustard, oil, and sometimes chili peppers, traditionally served with seafood.
- A thick, strongly seasoned sauce made with garlic, mustard, oil, and often chili, commonly served with seafood.
"The grilled fish was accompanied by a rich garlic rouille."
"We ordered the prawns with saffron rice and a spoonful of spicy rouille."
"She whisked mustard into olive oil to make a quick rouille for the grilled vegetables."
The usual plural, used when referring to multiple servings or portions of the sauce.
"The waiter brought separate bowls of rouilles for the grilled fish and prawns."
Its name comes from French, where rouille literally means “rust”—a surprising label for one of cuisine’s most pungent staples.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does rouille come from?
The English culinary noun is borrowed from French rouille, the name of a pungent garlic-and-mustard preparation. The French word also has older senses meaning “rust” and “rheumatism”; its culinary association developed from medicinal preparations valued for their warming and restorative qualities.
Related word forms
How rouille is actually used
A culinary term borrowed from French and encountered mainly in restaurant menus, cookbooks, and food writing. It is especially associated with Mediterranean and southern European-style seafood.
Easily confused with rouille
Rouille is a ready-made garlic-and-mustard sauce, whereas a roux is a cooked mixture of flour and fat used to thicken soups and sauces.