Sweet Potato Balls

1 or 2 sheets kazunoko konbu 1 or 2 cucumbers, halved length-wise and sliced 1/4 cup vinegar 2 tsp. sugar 2 tbsp. shoyu dash of monosodium glutamate Soak kazunoko kobu 30 to 45 minutes in water; slice in strips and combine with rest of ingredients. Let stand 5 to 10 minutes and serve in small…