Take the fresh lemongrass, cut the ends off and tenderize using a meat tenderizer, mortar and pestle or rolling pin (similar to rolling out dough). This helps release the fragrant and flavors of the lemongrass when it's cooking.
Place the vegetable oil in the pan along with the tenderized lemongrass and let sauté for 2 minutes.
Add the marinated chicken to the pot to sear.
Then add the coconut soda or coconut water if you cannot find coconut soda.
And chicken broth to the pot.
Close the lid and let the chicken simmer until chicken is cooked through. Approximately 1.5 hours.
Carefully open the lid and add in the carrots and cook it for 10 minutes with the lid on.
Then add the sweet potatoes and cook with the lid closed for another 10 minutes.
Lastly, add the russet potatoes and cook until it's soft.
Then pour in the can of full fat coconut milk.
Mix well and serve with a baguette, over rice or noodles.