This Peruvian Sandwich with Chicken or Turkey is based on a sandwich that we have had in Peru. Thin-sliced chicken or turkey tenderloin is grilled, and served on a bun smeared with ají amarillo mayonnaise, and topped with salsa criolla and avocado. This memorable Peruvian sandwich is easy to make for non-native home cooks that love Peruvian flavors. All you need is about 30 minutes, and you'll be enjoying this delicious, homemade sandwich!