Green Bean and Carrot Thoran

Name: Green Bean and Carrot Thoran
Ingredients: 2 tablespoons coconut oil; 1 teaspoon brown mustard seeds; 1 teaspoon cumin seeds; 8 to 10 fresh curry leaves (optional); 1 pound green beans, thinly sliced on the bias; 2 carrots, peeled and diced small; ½ teaspoon turmeric powder; 1 teaspoon salt; ½ cup frozen grated coconut, available at indian markets (or substitute finely grated dried unsweetened coconut soaked at room temperature in ¼ cup water until the water is absorbed); 3 garlic cloves; 1 serrano chile