Peel and dice the onion, ginger cloves, and garlic and set aside.
Rinse the celery stalks and dice them too.
Add oil to a large, deep frying pan or saucepan and add in the onion, ginger, and garlic and saute about 4-5 minutes over a medium flame. Make sure to stir often so they do not burn.
While the onion, ginger, garlic are sauteing, rinse the mung beans. Place the mung beans in a large bowl. Then, add water to the bowl to cover the mung. Stir the water a bit with your hands and then pour out the water. Usually, the water that is drained out is a bit murky. Then, add in more water and repeat the process until the draining water runs clear.
Add in the diced celery and saute about a minute.
Then add in the corainder, turmeric, smoked paprika, chili powder (if using), vegetable stock, coconut milk, and rinsed mung beans. Stir well.
Then, bring curry to a boil and cover and let simmer about 25-30 minutes or until green mung beans are tender.
Remove from the flame and stir in the parsley.
Season with salt and pepper and enjoy.