The Aji Amarillo is grown all over Peru. Aji means chili pepper and amarillo means yellow in Spanish. This pepper is considered part of the Peruvian "holy trinity" when it comes to their cuisine, along with garlic and red onion.
While this pepper is literally referred to as "yellow chile", its color changes to a bright orange as it ages. The chili pods have a thick skin, are 10 to 15 cm and are considered quite spicy (30,000 to 50,000 on the Scoville scale). But the aji amarillo balances that heat with a bit of fruity flavor. This chili smells a bit like raisins, and has a subtle aftertaste that can best be described as a mix between passion fruit and mango, which gives each dish a unique taste.