Shellfish allergy, understood in Spanish.

Mole · mole negro / mole poblano

Traditional mole negro and mole poblano contain peanuts, sesame seeds, and almonds all ground invisibly into the sauce alongside dried chiles and chocolate — a single plate of mole can trigger reactions to multiple allergens simultaneously, and none are detectable by sight or taste. In coastal Oaxaca, mole negro may also contain dried-shrimp broth, adding a shellfish allergen.

Peanuts and sesame are confirmed load-bearing ingredients in mole negro and mole poblano (Rick Bayless, Larousse Cocina, Pati Jinich). Almonds are standard in mole poblano; walnuts and pecans also appear in mole negro. Several mole varieties (coloradito, rojo, manchamantel) are thickened with stale bread or breadcrumbs, making them unsafe for celiac travelers. The shellfish risk (dried shrimp broth) is specific to Isthmus of Tehuantepec and coastal Oaxacan variants. Ask specifically: '¿Este mole lleva cacahuate, ajonjolí, nueces, o pan?'

Dried shrimp in salsas and mole negro · camarón seco

Dried shrimp (camarón seco) is ground as an invisible seasoning base in dark salsas and regional mole negro across Oaxaca and Mexico's Pacific and Gulf coasts. It is undetectable by sight or taste once ground into a sauce and is rarely disclosed by kitchen staff who do not think of it as an allergen ingredient.

Camarón seco is used both as a visible ingredient and as invisible ground seasoning. In the Isthmus of Tehuantepec and coastal Oaxaca, dried shrimp broth may replace turkey broth in some mole negro variants. Shellfish cross-contamination at marisquerías on the Pacific Coast and Gulf is also routine. Travelers with shellfish allergies should ask about salsa and sauce ingredients explicitly at any coastal or Oaxacan restaurant.

Tamales · tamales / masa para tamales

Traditional tamale masa (corn dough) is made with pork lard beaten directly into the dough itself, not just into the filling, so tamales contain pork even when the visible filling appears meat-free. Sweet regional varieties such as tamales canarios are made with butter and condensed milk, and tamales de harina from Michoacán are wheat-flour tamales that look identical to corn tamales.

Lard in the masa is structural and non-removable in traditional savory preparations. Sweet varieties (tamales canarios, tamales de elote) use butter and condensed milk instead of lard and are dairy-intensive. Wheat-flour tamales (tamales de harina, Michoacán origin) are sold alongside corn tamales with no visual distinction. In coastal Oaxaca and the Isthmus of Tehuantepec, tamales de camarón seco contain dried shrimp in the filling, visually indistinguishable from plain corn tamales. Ask: '¿La masa lleva manteca de cerdo?'

Ceviche · ceviche / ceviche mixto

Ceviche mixto combines fish and shellfish in the same dish, and shared preparation surfaces at marisquerías, markets, and street stalls make cross-contamination between fish and shellfish preparations virtually unavoidable. The citrus cure does not eliminate fish or shellfish allergens.

Regional ceviche varies by coast: Pacific and Sinaloa styles use raw fish and shrimp; aguachile is structurally shellfish-based; Veracruz versions incorporate mixed seafood. The allergenic proteins in shellfish (tropomyosin) and fish are not denatured by citric acid. FARE recommends avoiding seafood restaurants entirely for shellfish-allergic diners due to high cross-contact risk.