Green Tuna Salad

Ingredients

• 1 or 2 (5-ounce) cans of water-packed tuna, drained (how hungry are you?)
• ½ cup peeled and diced cucumber
• 1 stalk celery, diced
• 2 scallions, sliced
• ¼ cup halved green grapes
• 2 tablespoons chopped parsley
• 4 medium mint leaves, chopped
• ½ ripe Hass avocado
• 2 tablespoons mayonnaise
• 1 teaspoon lime zest
• 1 tablespoon lime juice
• ½ teaspoon salt
• ⅛ teaspoon black pepper
• 8 medium lettuce leaves and additional herbs, for serving