Although the sauce is named after Huancayo, the capital of Peru’s central highlands, this roasted potatoes with Huanciana sauce dish has come to represent classic Peruvian home cooking and is enjoyed all over the country. Traditionally, the sauce is used to smother boiled potatoes. I have added my own twist to this classic, roasting the potatoes in foil packets on the grill to give them some texture. This tangy, creamy, spicy sauce can be used to accompany many other dishes, but it pairs especailly well with seafood.