Make the tsukune: Combine all ingredients except the vegetable oil into a large mixing bowl and mix with your hands to combine. Rub a dime-size amount of vegetable oil onto the palms of your hands, and start making
meatballs that are 1½ inches in diameter, slightly smaller than a golf ball. Place them on a
baking sheet. If the meat starts sticking to your hands, add more oil to your hands. You should get about 18 balls.