Heat oil in a medium skillet over medium-high heat. When shimmering hot, add mustard seeds and allow them to pop. Then add asafetida, urad dal, curry leaves & red chilies. Cook, stirring frequently, until fragrant and dal turns light golden brown, about a minute.
Add green beans, salt; cover and cook, stirring occasionally until beans are crisp-tender, about 3 to 5 minutes. Stir in coconut.
Paruppa Podi (optional topping)
Roast Chana dal in a small stainless steel pan for 1 to 2 minutes on medium heat. Add coriander seeds and roast for another minute. Allow it to cool down completely.
Add to a spice grinder along with dried red chili. Grind to make a coarse powder. Spinkle on Green Bean Poriyal for a nutty and spicy flavor boost!
Notes
Equal amount of roasted peanuts or chana dal can be substituted for Urad Daal
You can also use frozen green beans instead of fresh in this recipe. Simply stir fry a few minutes longer.