Make the filling: Place the olive oil into a large skillet over medium heat. Add the asafoetida and once it sizzles, about 2-4 minutes, add the peas. Add 4 tablespoons of water to the peas, cover and let cook for 5-6 minutes until the peas are tender and the water has evaporated. Add the jalapeño, ginger, garam masala, fennel seeds, salt, sugar, and lemon juice and stir. Cook the mixture until the jalapenos have softened and the mixture is evenly coated with the seasonings, approximately 10-15 minutes. Coarsely mash the mixture off the heat with a potato masher and set it aside to cool, about 15 minutes.