Avocado-Lime Salad

Ingredients

• Tbs. fresh lime juice (1 large lime)
  3 unit
• ?2 tsp. plus 1?8 tsp. salt
  1 unit
• tomatoes

  cut into 3?4-inch dice (21?2 cups)
  4 small
• ripe medium avocados

  cut into 3?4-inch dice (11?2 cups)
  2 unit
• scallions (white and light green parts)

  thinly sliced
  3 unit
• clove garlic

  minced
  1 large
• Tbs. olive oil or vegetable oil
  1 unit
• ?4 tsp. ground cumin
  1 unit
• head Boston lettuce

  torn into large pieces (8 cups)
  1 large
• cucumber

  peeled, quartered lengthwise, seeded and thinly sliced diagonally (1 cup)
  1 medium
• Tbs. coarsely chopped cilantro
  2 unit