Cut the sweet potatoes into 1 inch slices and boil in salted water until tender. Drain and mash. Add milk and seasonings.
Work the mixture as little as possible.
Add more milk if they seem dry.
Sweet potatoes have beige skin and pale yellow meat. Yams have purplish skin and bright orange meat. I have seen them mislabeled in stores. They vary in size so for portion sake let's use the equaivalent of 2 large baked potatoes.