Catalan cuisine from northeast Spain is one of Europe's most distinctive regional traditions — characterised by the concept of 'mar i muntanya' (sea and mountain), which combines seafood with meat in the same dish (chicken with prawns, rabbit with monkfish). This combination sounds jarring to outsiders but works because the cooking liquid — built from sofregit (Catalan sofrito), fish stock, and picada — creates a medium that bridges both proteins. Romesco sauce (roasted red peppers, almonds, hazelnuts, garlic, bread, tomato, vinegar, olive oil) is the region's signature condiment, served with grilled meats, fish, and calcots (grilled spring onions).
Sofregit: the Catalan base — onion cooked very slowly in olive oil for 30-45 minutes until dark and jammy, then tomato grated in (Catalan technique: halve tomato crosswise and grate the cut side on a box grater, discarding the skin). The grated tomato is cooked down until the oil separates. Picada: a mortar-pounded paste of almonds, hazelnuts, garlic, parsley, fried bread, and sometimes saffron — added near the end of cooking to thicken and enrich stews. This is uniquely Catalan and has no equivalent in other Spanish or European cooking. Romesco: ñora peppers (dried, round, mild) are soaked and scraped of their flesh, blended with roasted red peppers, toasted almonds and hazelnuts, garlic, bread fried in olive oil, tomato, sherry vinegar, and olive oil.
For calcotada (the Catalan spring onion festival): calcots are grilled directly over vine cuttings until the outside is completely charred and black. The charred outer layers are peeled away to reveal the sweet, tender inner layers, which are dipped in romesco sauce and eaten by holding the calcot above your mouth and lowering it in. Newspaper bibs are traditional. For mar i muntanya: brown chicken pieces and set aside, cook prawns and set aside, build the sofregit in the same pan, add fish stock, return both proteins, finish with picada. The combined flavours are greater than either alone.
Rushing the sofregit — 30 minutes minimum for the onions, then the tomato needs to cook until the oil separates. Using regular dried chillies instead of ñora peppers for romesco — ñoras have a specific sweet, mild flavour. Not toasting the nuts for picada — raw nuts produce a flat, starchy paste. Thinking mar i muntanya is fusion — it's a tradition with centuries of history in coastal Catalonia. Making romesco too smooth — it should have some texture from the nuts.