Peruvian cuisine is built on the ají — a family of chilli peppers (ají amarillo, ají panca, rocoto) that define the flavour profile of the country. Ají amarillo (bright orange, fruity, medium heat) is used in virtually everything — ceviche leche de tigre, causa, ají de gallina, papa a la huancaína. Ají panca (dark, smoky, mild) provides depth in stews and marinades. The technique of working with these chillies — charring, deveining, blending into pastes and sauces — is the foundational skill of Peruvian cooking. Anticucho (grilled beef heart on skewers marinated in ají panca and vinegar) represents the country's grilling tradition inherited from both Indigenous and African influences.
Ají amarillo paste: fresh ají amarillo peppers are deveined and deseeded, boiled for 10 minutes to reduce heat, then blended into a smooth paste. This paste is the base of dozens of dishes. Ají panca paste: dried ají panca are soaked in hot water, then blended. Provides dark colour and smoky depth. For anticuchos: beef heart is cut into 2cm cubes, marinated overnight in ají panca paste, vinegar, cumin, garlic, and oregano. Grilled over charcoal on skewers, basted with the remaining marinade during cooking. The heart's lean, dense muscle is ideal for grilling — it stays tender when cooked medium-rare to medium. For causa: layers of seasoned cold mashed potato (mixed with ají amarillo paste, lime juice, and oil) with fillings of tuna, chicken, or shrimp between the layers — essentially a Peruvian potato terrine.
Ají amarillo paste in a jar is available in Latin grocery stores and online — it's the one shortcut that Peruvian cooks accept for weeknight cooking. For papa a la huancaína: blend ají amarillo paste with queso fresco, evaporated milk, crackers, and oil into a smooth, bright orange sauce. Pour over boiled potatoes. It's Peru's most beloved casual dish. The Nikkei tradition (Japanese-Peruvian fusion) produced tiradito — raw fish sliced sashimi-style with ají amarillo leche de tigre, which bridges two of the world's great raw fish traditions.
Substituting generic chilli for ají amarillo — the fruity, floral heat is distinctive and not replaceable. Not deveining or boiling ají amarillo before making paste — the raw seeds and membranes are too hot. Overcooking beef heart — it should be medium-rare to medium, like a steak. Not enough cumin in anticucho marinade — it's a signature spice. Treating Peruvian food as a subset of Mexican — they share chillies as a concept but the specific varieties and techniques are entirely different.