fish fillets (bonito or similar firm white fish) • red onion • red wine vinegar (120 ml) • fish stock (240 ml) • Salt and pepper to taste • all-purpose flour (about 65 grams), or a bit more as needed • yellow chili pepper (ají amarillo) • cilantro and parsley • dried oregano • tomato • large garlic clove • blended ají panca (Peruvian red chili paste) •