Bring a pot of water to a boil. Place the pahole fern in water for 3 1/2 minutes. Remove and drain. Cool pahole fern down in an ice bath and drain. Dice tomatoes, cut pahole fern into 3/4-inch long pieces, and slice onions.
In a bowl mix all sauce ingredients together Add tomatoes, pahole, onions, and taro toss to coat.
Recipe courtesy of Old Lahaina Luau, Lahaina, HI