PUNO, Peru — At a market along frigid Lake Titicaca, the vendor caught a visitor eyeing her display of chuno, black and white potatoes as hard as charcoal briquettes. She explained how they are made: ...

This unusual potato salad from Peru is dressed with a sauce of coconut milk, cheese and aji amarillo (yellow chili powder). The sauce and potatoes can be made a day ahead and refrigerated. In a large ...