Make marinade/dressing: In a small mixing bowl, whisk together dijon mustard, 2.5 tbsp olive oil, lemon juice, parsley, and balsamic vinegar.
Cook lobster: preheat oven to 400F. Brush half the marinade over the lobster tails and top each with minced garlic. Bake for 8-10 minutes or until lobster is fully cooked through (it will be tender and opaque on the inside).
Prepare salad: while lobster is cooking, pull apart lettuce leaves and top with tomatoes, avocado, mango, pomegranate seeds, and remaining marinade/dressing. When the lobster is finished cooking, remove from oven and let cool. Then slice each lobster tail into 1 inch pieces and place on top of salad.