Ingredients

• 3 tablespoons fresh lime juice (1 large lime)
• 1/2 teaspoon salt, plus
• 1/8 teaspoon salt
• 4 small tomatoes, cut in 3/4-inch pieces (2 1/2 cups)
• 3 scallions, thinly sliced (white and green parts)
• 1 tablespoon extra virgin olive oil
• 1/4 teaspoon ground cumin
• 1 head boston lettuce, torn into large pieces (8 cups)
• 1 medium cucumber, peeled, quartered lengthwise, seeded and thinly sliced diagonally (1 cup)
• 2 tablespoons coarsely chopped fresh cilantro
• 1 large garlic clove, minced
• 2 medium ripe avocados, cut into 3/4-inch dice (1 1/2 cups)