Anticuchos are popular street food in south america, especially in peru. The most traditional peruvian anticuchos are made of beef heart, but marinated chicken (anticuchos de pollo) or steak anticuchos are also popular. Peruvian-style anticuchos are seasoned with garlic, vinegar, cumin, and aji panca, a mild red chile pepper with a smoky flavor that is widely used in peruvian cooking. You can find dried aji panca or jarred aji panca paste in specialty stores or latin food markets, or online.