Southwestern Barley Salad

Ingredients

• 3 cups cooked medium pearl barley
• 1 can (15 ounces) black beans, rinsed and drained
• 1-1/2 cups frozen corn, thawed
• 1-1/2 cups chopped seeded tomatoes
• 1 cup frozen peas, thawed
• 1/4 cup minced fresh cilantro
• 1 teaspoon salt
• 1/4 teaspoon pepper
• 1/2 cup water
• 3 tablespoons lemon juice
• 1 tablespoon finely chopped onion
• 1 tablespoon canola oil
• 2 garlic cloves, minced
• 8 lettuce leaves
• 1 ripe avocado, peeled and sliced
• 2 medium tomatoes, cut into wedges