Grilled Chicken Salad

Name: Grilled Chicken Salad
Cuisine: American
Ingredients: 3 large whole chicken breasts, split; 1 medium onion, thinly sliced; 6 cloves garlic, minced; ⅓ cup fresh lime juice; ¼ cup olive oil; ¼ cup vegetable oil; 1 teaspoon chopped fresh mint; Salt and freshly milled black pepper; Salt and freshly milled black pepper; 1 medium head iceberg lettuce-outer leaves discarded, cored, and thinly sliced; 1 medium head iceberg lettuce-outer leaves discarded, cored, and thinly sliced; 3 large ripe tomatoes-peeled, seeded, chopped, and chilled; 6 green chile or jalapeño peppers—roasted, seeded, deveined, and chopped (see Basics); 6 green chile or jalapeño peppers—roasted, seeded, deveined, and chopped (see Basics); 6 green chile or jalapeño peppers—roasted, seeded, deveined, and chopped (see Basics); ½ cup piñon nuts, toasted (see Basics); 3 ripe avocados