Grilled Flank Steak with Mojo and Plantains

Name: Grilled Flank Steak with Mojo and Plantains
Ingredients: 1/4 cup vegetable oil, plus for brushing; 1 tablespoon plus 1 teaspoon ground allspice; 1 1/2 tablespoons kosher salt, plus additional for seasoning; 2 teaspoons granulated garlic powder; 1 teaspoon cayenne; 1 teaspoon freshly ground black pepper; 1 flank steak (about 1 1/2 pounds); 1/4 teaspoon whole cumin seeds; 1/4 cup extra-virgin olive oil, plus more for brushing; 3 cloves garlic, minced; 1/2 cup fresh lime juice; 1 teaspoon chopped fresh oregano leaves or 1 teaspoon dried, crumbled; 1 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 1 jalapeno chile, seeded and minced; 2 ripe yellow plantains