In a large mixing bowl combine the chicken, grapes, apples, cucumber, and scallions. Stir together.
In a small bowl, combine the mayo, fresh lemon juice, dill weed, sea salt, and onion powder. Whisk together.
Pour the dressing into the large mixing bowl and stir to evenly coat all ingredients with dressing.
In each romaine lettuce leaf 'boat' add 2-3 scoops of chicken salad to the center of the leaf. Roll sides of lettuce in to the middle and serve.
Store leftovers in a covered container in the fridge for up to 5 days.
Read notes in post about how to pack this recipe for on-the-go lunches.