For a low-carb meal that combines a sophisticated nioise salad and an all-american tuna-salad sandwich, look no further than these lettuce cups. The romaine lettuce leaves cradle chunks of white tuna, chopped hard-boiled eggs, salty parmesan, and a splash of store-bought caesar salad dressing. And low-carbs just the beginning. This recipe also packs in the omega-3s and protein. Look for canned tuna thats troll-or pole-caught, both environmentally sustainable fishing practices that ensure other sea creatures arent snagged in vast tuna nets. Turns out, its worth spending a bit more on great canned tuna; tasty and eco-conscious brands include wild planet, american tuna, and ocean naturals.