Corn Usal in Puff Pastry

Name: Corn Usal in Puff Pastry
Ingredients: 1 1/2 teaspoons vegetable oil; 1/2 teaspoon mustard seeds; Pinch asafoetida; 3 green chilies, chopped; 1 sprig curry leaf (optional); 1/2 teaspoon turmeric; 1/4 teaspoon cayenne; 1 large onion; 3 ears corn, kernels removed and cobs discarded; 1/2 cup fresh (unsweetened) coconut, or dried coconut that has been rehydrated by soaking in warm water for a few minutes; 1 tablespoon fresh lemon juice (about 1/4 lemon); Salt to taste; chopped cilantro for garnish (we like our cilantro, so I used 1/2 cup, but you can add as much or as little as you like); 1 package puff pastry sheets, thawed (if you want to make pockets with the usal)