Peruvian Fish Ceviche

Ingredients:

1 1/4 pounds fish fillets (sea bass, sole, or flounder), cut on the bias into 1-inch dice
1 quart water, boiled and chilled
1 red onion, cut in 1/2 lengthwise and sliced thin
1 aji amarillo, rib and seeds removed, diced
1 clove garlic
Salt and pepper
1/4 cup fresh lime juice
1/4 cup fresh lemon juice
2 teaspoons finely chopped cilantro leaves
2 ears corn, cut in 1/2
1 sweet potato, sliced 1/4-inch thick
2 tablespoons canola oil
1 head butter lettuce
Japanese seaweed, for garnish

How to make it:

Have grill pre-greased and preheated to medium-high.
Place fish in a non-reactive bowl. Add 3 cups of chilled water to fish and rinse gently. Drain water.
Add onions to remaining chilled water and let soak.
Meanwhile, place aji, garlic, and pinch of salt in a mortar and pestle. Grind to make a paste.
Combine fish, lime and lemon juices, aji and garlic paste, salt, pepper, and cilantro. Let marinate for 10 minutes.
Brush corn and sweet potato slices with oil and place on grill. Cook about 10 minutes.
When ready to serve, divide fish ceviche among 4 lettuce cups and top with onion slices. Serve with grilled corn and sweet potato slices and garnish with Japanese seaweed, if desired.