Season shrimp and set aside. Peel potato and shred in food processor. Chop 1/2 lb of shrimp in processor(uncooked). Mix together processed shrimp, potato, remaining shrimp, egg, minced onion, green onion to taste (about 3). Gradually mix in the flour until mixture becomes paste-like (should be able to form boulette by hand). Season to taste.
In deep fryer or skillet, drop by spoonfuls the shrimp mixture into hot oil and let fry until golden.
Cajun Country -- New Iberia, Louisiana