Fish allergy, understood in Spanish.

Paella and rice dishes cooked in shellfish stock · paella de marisco / arroz a banda / arroz caldoso / fideuà

Even nominally shellfish-free paella and rice dishes are routinely cooked in caldo de marisco (shellfish stock), saturating every grain with shellfish protein. Many restaurants proactively turn away shellfish-allergic diners rather than guarantee safety, and fideuà uses the same stocks in noodle form.

Highest-impact Spain-specific risk. The shared shellfish stock is most common in restaurants that primarily serve seafood paella; dedicated chicken paella kitchens may use chicken stock. Verify per establishment. Fideuà also adds gluten via noodles.

Shared deep fryer in tapas bars · freidora compartida

A single commercial fryer is used continuously for calamares, gambas, croquetas, patatas bravas, boquerones, and churros throughout service. Any item fried after shellfish or breaded fish carries shellfish protein, fish protein, and gluten in the cooking oil.

A shared fryer is standard in Spanish tapas bars and is the primary cross-contamination vector for shellfish, fish, and gluten when ordering otherwise-safe fried items. Legal Nomads flags confirming fryer status as critical for celiacs, and Food Allergy Getaways warns that fried tapas carry seafood cross-contact. Ask whether there is a dedicated fryer.

Croquetas · croquetas de jamón / croquetas de bacalao

Croquetas have a wheat-flour bechamel interior (gluten and dairy), a wheat-breadcrumb exterior, and a standard egg coating before frying. The most common variety is jamón (pork), but bacalao (salt cod) croquettes look identical on the outside, and mixed trays in tapas bars are rarely labeled.

The wheat-flour-and-milk bechamel plus wheat breadcrumb coating is the structural base (FACE / celiacos.org). The jamón filling adds pork; the bacalao version adds fish and is visually indistinguishable from non-fish versions in mixed tapas trays. The exterior egg coating is standard for breaded croquetas.

Ensaladilla rusa (Russian potato salad) · ensaladilla rusa

Spain's ubiquitous cold potato salad tapa contains egg-based mayonnaise, hard-boiled egg, tuna, and often prawns as structural ingredients, not optional garnishes. Tuna and anchovy are not classified as 'carne' in Spanish culinary tradition, so a 'sin carne' claim does not exclude them.

Prawns are common but not universal (some versions contain only tuna). The anchovy-stuffed olive garnish is variable. Because the dish is built on mayonnaise and tinned fish, it is neither vegetarian-safe by default nor free of fish/shellfish.