Avocado Salad with Avocado Lime Vinaigrette

Name: Avocado Salad with Avocado-Lime Vinaigrette
Ingredients: 2 Haas avocados - peeled, pitted, and cut into 1/2-inch slices; 1 lime, juiced, divided; 1/4 cup extra-virgin olive oil; 3 tablespoons rice wine vinegar, or more to taste; 1 clove garlic, minced; salt and ground black pepper to taste; 4 cups chopped leafy green lettuce, or more to taste; 1/4 cup very thinly sliced red onion