Wash, pat dry and do a rough chop of the lemongrass, garlic, chili, shallot and ginger.
In a food processor, or high-powered blender, combine the lemongrass, garlic, chili, shallot and ginger with coconut milk until mostly smooth.
In a slow cooker, or pot on the stove, stir together herbed coconut milk mixture with fish sauce, turmeric powder, sugar and butter.
Place chicken into the same pot and cover with sauce.
Let cook on high for 2-3 hours in the slow cooker or until chicken is cooked through.
Cook rice according to package about 30 minutes before chicken is done.
Using a fork, break chicken into smaller pieces, about 2 inches.
Serve chicken with sauce over hot rice with cilantro for garnish. Add salt & pepper to taste.