Appetizer: Mexico – Gulf Coast Mexico — Tamaulipas – Tostadas de Mariscos (Seafood Tostadas)

Serving Size: 6

Approximate Time

Prep 20 min

Cook 5 min

Additional 15 min

Total 40 min

Ingredients

- 1 lb (454 g) medium shrimp, peeled and deveined (approx. 12–16 shrimp)
- 8 oz (225 g) cooked octopus, sliced
- 8 oz (225 g) firm white fish fillet (snapper or grouper), cut into 1/2-inch (1 cm) pieces
- 3 tbsp (45 ml) fresh lime juice (about 2 limes)
- 2 tbsp (30 ml) vegetable oil or olive oil
- 1 tsp (5 g) kosher salt, divided
- 1/2 tsp (2.5 g) ground cumin
- 1/2 tsp (1 g) dried Mexican oregano
- 1/4 tsp (1 g) freshly ground black pepper
- 12 corn tostada shells
- 2 cups (150 g) shredded green cabbage
- 2 ripe avocados, sliced
- 1/2 cup (15 g) fresh cilantro leaves, chopped
- 2 limes, cut into wedges for serving

Salsa de Chile de Arbol (spicy salsa)
- 6–8 dried chile de arbol (or 3–4 chile de arbol + 1 small chile de arbol for mild heat)
- 2 Roma (plum) tomatoes (about 6 oz / 170 g)
- 1 small garlic clove
- 2 tbsp (30 ml) white onion, roughly chopped
- 1 tbsp (15 ml) fresh lime juice
- 1/2 tsp (3 g) kosher salt
- 1 tbsp (15 ml) vegetable oil (for toasting chiles/tomatoes)

Quick pickled red onion (optional)
- 1/2 small red onion, thinly sliced
- 1/4 cup (60 ml) white vinegar
- 1/4 cup (60 ml) water
- 1 tsp (5 g) sugar
- 1/2 tsp (3 g) salt

Instructions

Short Description:
Crisp corn tostadas piled with a warm, lime‑bright mix of Gulf seafood (shrimp, octopus, and firm white fish), finished with avocado, shredded cabbage, cilantro, and a spicy salsa de chile de arbol. Light, tangy, and spicy—perfect for sharing as a coastal starter.

Regional Notes:
This Tamaulipas version uses a mixed local seafood medley seared or simmered and then brightened with fresh lime and regional spices rather than being served fully raw like some Pacific ceviches. A smoky, spicy salsa de chile de arbol and creamy avocado reflect Gulf Coast flavors and coastal produce availability.

1. If using raw octopus, simmer it in gently boiling salted water until tender (about 40–60 minutes depending on size), then drain and slice. If using pre-cooked octopus, slice and set aside.
2. Marinate the seafood: in a bowl combine shrimp, fish pieces, sliced octopus, 3 tbsp (45 ml) fresh lime juice, 1/2 tsp (2.5 g) kosher salt, 1/2 tsp (2.5 g) ground cumin, 1/2 tsp (1 g) dried oregano, and 1/4 tsp (1 g) black pepper. Let sit 8–10 minutes while you prepare other components (the lime will lightly flavor the seafood but proteins remain cooked in next step).
3. Make quick pickled red onion (optional): combine vinegar, water, sugar, and salt in a small jar; add sliced red onion and refrigerate at least 10 minutes.
4. Prepare the salsa de chile de arbol: heat 1 tbsp (15 ml) oil in a skillet over medium heat. Toast dried chiles briefly 20–30 seconds per side until fragrant (be careful not to burn). Toast Roma tomatoes cut-side down until blistered, about 3–4 minutes total, and lightly char the garlic clove and onion pieces in the same skillet.
5. Transfer toasted chiles, tomatoes, garlic, and onion to a blender or molcajete. Add 1 tbsp (15 ml) lime juice and 1/2 tsp (3 g) salt; blend to a smooth or slightly textured salsa, adding 1–2 tbsp (15–30 ml) water if needed to reach desired consistency. Taste and adjust salt/heat.
6. Cook the marinated seafood: heat 2 tbsp (30 ml) oil in a large skillet over medium-high heat. Add shrimp and fish pieces in a single layer and sear 1–2 minutes per side until just cooked through (shrimp will be pink and firm, fish opaque). Add sliced octopus last and toss to warm through 1 minute. Remove from heat and drizzle remaining lime juice if desired.
7. Assemble tostadas: place a small handful (~1/4 cup / 30 g) shredded cabbage on each tostada shell to form a bed. Divide the warm seafood mixture among the 12 shells (about 2 shells per person if serving 6), piling the seafood over the cabbage.
8. Top each tostada with 2–3 slices of avocado, a spoonful of salsa de chile de arbol, a sprinkle of chopped cilantro, and pickled red onion if using. Serve immediately with lime wedges.
9. To eat, squeeze extra lime over the tostada and enjoy. Leftover seafood keeps refrigerated up to 24 hours but is best served warm and fresh.