Caribbean Chicken Medallions

Name: Caribbean Chicken Medallions
Ingredients: 3 tablespoons Jamaican jerk spice, divided; 1 cup flour; 1 egg; 1/4 cup coconut milk; 1 lime, juiced; 4 boneless skinless chicken breast halves; 1/2 cup canola oil; 4 sprigs cilantro; 4 scallions (root cut off, 5-inches remain, green top reserved); 4 ripe plantains; 1 cup evaporated milk; 1/2 brown sugar; 1/4 teaspoon ground nutmeg; 4 tablespoons unsalted butter; 1/4 cup shallots, diced; 1 jalapeno, seeded and diced; 1/4 teaspoon salt; 1/4 teaspoon pepper; 1 clove garlic, mashed and 1 clove, chopped; 1 mango, peeled, pitted cut in half; 1 lime, zested and juiced; 1 cup sour cream; 3/4 cup chopped fresh cilantro leaves