Potatoes are sweeter when they are small, and bite-size potatoes are perfect for dipping. Spear them with toothpicks and dip them in the rich cream ají sauce, made with aji amarillo chile pepper paste. Aji amarillo is a bright orange-yellow chile pepper that is essential to many Peruvian dishes. It has a fruity sweet flavor that is delicious and unique. You can buy jarred aji amarillo paste at Latin food markets.