4 tea. salt
4 Tab. butter or margarine
1 tea. grated ginger
1/2 tea. maple syrup
Bring a large pot of water to boil. Add sweet potatoes and salt and cook 25 minutes. Drain, reserving 1/2 cup cooking liquid and return potatoes to pot with the liquid. Add butter, ginger, maple syrup and nutmeg to taste. Use a potato masher or electric hand mixer to mash potatoes. You may want to add salt, lemon juice or more syrup to taste.
source: One Bite at a Time, Rebecca Katz