
Romesco
Romesco is a Catalan sauce of roasted tomatoes and garlic, toasted nuts, dried nyora peppers, bread and oil, traditionally served with seafood, grilled meat and calcots.
Salsa de calçots · Calçot sauce
Salvitxada is a Catalan sauce from Valls, thickened with toast rubbed with garlic, served almost only with calcots at the calcotada barbecue.

Salvitxada is a Catalan sauce from Valls, in the province of Tarragona. It is also called salsa de calcots, the calcot sauce. It is served almost only with calcots, the thick spring onions roasted over an open fire at the calcotada, the traditional outdoor barbecue of the district.
Its body is toast, not nuts. The toast is rubbed with fresh garlic, moistened with a little vinegar and pounded, which gives a thick, sharp paste that is spooned or dipped against the sweet, charred onion.
Salvitxada is close to romesco, the nut and pepper sauce of the same region. The key difference the page gives is the thickener: garlic-rubbed toast rather than the nuts and pepper of romesco. The two are often confused, and a Valls cook would treat them as separate sauces. Sources give no quantities, so no measure is recorded here.
The page gives Valls as the place of origin and no date. The Valls calcot tradition is recorded in a source that credits a farmer with the calcot of 1898, presented as tradition rather than documentation.
The page gives Valls, in the province of Tarragona, as the place of origin, with no date.
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WikipediaDefinition · Method · Uses
SalvitxadaAlso called salsa de calcots; from Valls, Tarragona, Catalonia; served almost exclusively with calcots at calcotades.
Toast, garlic and vinegar; thickened with garlic-rubbed toast, pulverised.