2 TBS butter
3½ lbs. sweet potatoes (mixture of Kotobuki, Jewel and/or Okinawan)
1 cup baked sweet potatoes, mashed (Kotobuki or Okinawan for delicate, nutty flavor; Jewel or Garnet for sweet flavor)
Equal parts of soy sauce and rice vinegar.
½ cup grated onion
4 cups (packed) coarsely grated Kotobuki sweet potatoes (about 1 - 2 medium size)
Toppings: sour cream, yogurt or applesauce
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