Mango Curry

Name: Mango Curry
Ingredients: 2 green, unripe mangoes, peeled and sliced (2 cups); 4 shallots, thinly sliced (about ½ cup); 4 Indian or Thai green chiles, halved lengthwise; 1 (1-inch) piece ginger, peeled and cut into thin matchsticks; 3 cloves garlic, cut into thin matchsticks; 3 Tbsp coconut vinegar or white vinegar; 1½ tsp salt; 3 cups coconut milk; 1 Tbsp coconut oil; 1½ tsp black mustard seeds; 4 dried red chiles, snapped in half; 20 curry leaves; Fried Onions for garnish (optional); Basmati Rice to serve