For the ceviche: Combine the tilapia, lime juice, diced aji amarillo, parsley, olive oil, garlic, aji amarillo paste, salt, pepper and onion in a large mixing bowl and mix well. Cover and chill to marinate, at least 4 hours and up to 24 hours.
For assembly: Preheat the oven to 325 degrees F. Roast the corn in the oven until tender, about 30 minutes. Let the corn cool 10 minutes before shucking and cutting cross-wise into 1-inch pieces. Set aside.
Heat a deep-fryer or large skillet with oil to 350 degrees F. Deep fry the sliced sweet potato until tender and set aside.
Place 4 ounces of the ceviche per bowl. Place 3 slices of fried sweet potato and 3 sections of roasted corn on each plate. Sprinkle the chili powder over the sweet potato and corn, and top the corn with the Cotija cheese. Place one bowl on each plate with the sweet potato and corn, and serve with the tortilla chips, if using.
*Aji amarillo is a yellow Peruvian chile and can be found in Latin American specialty stores.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.
Recipe courtesy of Cheryl and Beto Mijangos, Beto's Comida Latina