Vegetarian Mexican Salad Boats

Name: Vegetarian Mexican Salad Boats
Ingredients: 5 Tablespoons Extra Virgin Olive Oil, Divided; 1 whole Sweet Potato, Finely Diced; 1 Tablespoon Cumin; 1 Tablespoon Chili Powder; 2 pinches Coarse Salt And Freshly Ground Pepper, Divided Use; 1 whole Lime; ½ cups Cilantro, Roughly Chopped, Plus More For Garnish; 1 can (14 Oz Can) Black Beans, Drained And Rinsed; 1 can (10 Oz Can) Sweet Corn, Drained And Rinsed; 10 whole Cherry Tomatoes, Halved; 4 whole Radishes, Thinly Sliced; 1 whole Avocado, Peeled, Pitted, And Diced; 15 leaves Large Romaine Hearts Leaves, Rinsed