Ceviche Verde

Name: Ceviche Verde
Cuisine: American, Mexican, Latin American
Ingredients: 1 pound fresh Pacific halibut or other firm-fleshed fish; 1 teaspoon kosher salt; 3 tablespoons fresh lime juice; 2 ripe avocados, peeled and pitted; 3/4 cup green olives, sliced; 1/2 cup tomatillos, diced; 1/4 cup onion, very finely chopped; 1/4 cup fresh cilantro leaves; 1 jalapeño, stemmed, seeded, and minced (optional); 2 tablespoons olive oil; Tostadas or torilla chips