Place olive oil in a large pot over medium-high heat. Once hot, add onions and sauté for 3-4 minutes until slightly softened.
Add the celery, carrot and garlic to the pot. Cook another 5 minutes then add turmeric and stir to combine.
Add zucchini and green beans to the pot along with crushed tomatoes, broth and juice and zest from 1 lemon. Stir to combine all the ingredients and summer over medium heat for 15 minutes.
Next, add the rinsed mung beans into the pot, season with salt and pepper, stir and simmer another 10 minutes until the mung beans are softened but retain a little bit of a bite.
Add remaining lemon juice and zest. Adjust salt and pepper to taste and serve with fresh parsley.