Prep sweet potatoes
Preheat oven to 400ºF (200ºC). Prick the sweet potatoes all over with a fork. Wrap each in a piece of aluminum foil and place the sweet potatoes on a rimmed baking sheet.
Bake sweet potatoes
Bake until very tender, about 1 hour. Let cool to the touch then halve the sweet potatoes.
Whip sweet potatoes
Scoop out the flesh and add to a food processor fitted with a blade attachment or blender then discard the skins.
Add butter and honey
Add the butter and honey and blend until the mixture is smooth. Season with kosher salt to taste.
Assemble and serve
Serve hot in a serving bowl topped with Gorgonzola cheese and walnuts.