Heat the oil in a large frying pan (skillet) over medium heat, add the asafoetida and cumin seeds, and fry for about 1 minute, then add the peas, amchoor, and garam masala and, season with salt.
Mix well, then reduce the heat, cover, and cook, stirring occasionally, for about 15 minutes, or until the peas are tender.
Adjust the seasoning, if necessary, and serve.