Sweet Potato Plantain Bites

Name: Sweet Potato Plantain Bites
Ingredients: 1 pound sweet potatoes; 1 ripe plantain; 1 teaspoon ground coriander; 1 teaspoon ground cumin; 3 cloves garlic, grated; 1/2 cup whole wheat pastry flour (or all purpose flour); juice of 1/2 a lime; handful of fresh cilantro, finely chopped; salt and pepper to taste; olive oil (for rubbing the sweet potato); black sesame seeds (optional)