After soaking the lima beans overnight, drain the water and rinse them. Cook the soaked beans in an Instant Pot for 8 minutes or until they are soft and tender. Once cooked, drain any excess water and set the beans aside.
In a blender, add the oil roasted green chilies & curry leaves along with coriander leaves, grated coconut, salt, sugar, and lemon juice to the paste and blend until everything is well combined. Set this masala paste aside.
Heat oil in a pan on medium heat for tempering. Add mustard seeds and let them splutter. Then, add turmeric powder, asafetida, and curry leaves. Sauté for a few seconds until the spices become fragrant.
Add the cooked lima beans to the pan with the tempered spices. Mix well to coat the beans with the spices.
Pour the blended masala paste into the pan with the lima beans. Stir well to ensure that the beans are evenly coated with the masala paste. If the mixture seems too dry, you can add a little water to adjust the consistency.
Cook the lima beans with the masala paste for a few more minutes, allowing the flavors to meld together. Taste and adjust seasoning if needed. Once done, turn off the heat.
Transfer the Lima Beans Sundal to a serving dish. Garnish with some freshly chopped coriander leaves on top for added freshness and flavor.