Wash and peel the sweet potatoes, then cut them into 1 1/2 to 2-inch chunks. Place them into a large pot and cover them with cold water (they should be covered by 4 or so inches of water so they cook evenly). Place the pot on the stove, add some salt and turn the heat on high to bring to a boil.
Once boiling, cook about 8 minutes, until they are tender but not falling apart. Drain thoroughly, then pop them back into the pot and place them over medium heat to dry them out a bit. Add the buttermilk, pepper and some salt to taste.
Using a potato masher, mash up the sweet potatoes until smooth, and serve them alongside Creole Meatloaves with Trinity Gravy.