sauce Robert (uncountable)
- A sauce based on chopped onions and mustard.
1831, L[etitia] E[lizabeth] L[andon], chapter XXIII, in Romance and Reality. […], volume I, London: Henry Colburn and Richard Bentley, […], →OCLC, page 305:Adelaide was too quick-sighted not to perceive that Miss Arundel, when she first saw her talking to Lorraine, wore a very different air from Miss Arundel listening to Merton; and a rival was the sauce Robert, which would have made her not eat, but flirt with her grandfather.
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