Crisp Okra in Yogurt Sauce

Name: Crisp Okra in Yogurt Sauce
Ingredients: 7 tablespoons vegetable oil, divided; 1 pound okra, trimmed and sliced into 1/8-inch-thick rounds; Salt; 1 cup grated dried unsweetened coconut; 1 teaspoon brown mustard seeds, divided; 1/2 teaspoon cumin seeds; 1 small fresh green chile, such as serrano, Thai, or jalapeño, stemmed and quartered; 1/2 cup to 1 cup water; 1 cup plain yogurt (not Greek-style); 1/8 teaspoon hot red pepper flakes; 10 fresh curry leaves (optional); 1 teaspoon fresh lemon juice