Tuna Salad Lettuce Wraps

Name: Tuna Salad Lettuce Wraps
Prep time: 25 min
Total time: 25 min
Cuisine: American
Ingredients: two 5 oz. cans good quality canned tuna (see notes); 1/4 cup mayo; 1 tsp. Dijon mustard; 2 T fresh lemon juice, divided (see notes); 1/2 tsp. celery seed; salt or Vege-Sal to taste; 2 T dill pickle relish; 2 T capers; 1/4 cup thinly sliced green onions (more or less to taste); 8 large Romaine Lettuce leaves, washed and dried (see notes); 1 cup chopped cherry tomatoes (optional); 1 large avocado, chopped small (optional)