Caribbean Plantain Coconut Curry

Name: Caribbean Plantain Coconut Curry
Ingredients: 2 ripe plantains; 1 tablespoon vegetable oil; 1 medium onion, chopped; 3 cloves garlic, minced; 1 inch piece fresh ginger, grated; 1 teaspoon ground turmeric; 1 teaspoon ground cumin; 1 teaspoon ground coriander; 1 teaspoon paprika; 0.5 teaspoon ground cinnamon; 0.25 teaspoon cayenne pepper; 240 ml coconut milk; 240 ml vegetable broth; 1 large tomato, chopped; 1 tablespoon brown sugar; 1 teaspoon salt; 0.5 teaspoon ground black pepper; 0.25 cup chopped fresh cilantro; 1 tablespoon lime juice; 2 tablespoons chopped scallions