Pre-heat oven to 400 degrees and lightly grease a large baking sheet.
In a large bowl, add turkey and garlic and ginger and mix well. Then add egg, panko, sesame oil, and 1 tablespoon of soy sauce and mix well.
Roll out 1 1/2 - 2 inch meatballs and place on baking sheet. (Approximately 20)
Bake for 10 mins and then rotate pan and bake for another 10 minutes.
Heat a large saute pan to medium. Transfer meatballs to a large saute pan that will fit them all. In a small bowl mix the remaining 3 tablespoons of soy sauce and 2 tablespoons of hoisen. Coat and turn meatballs in sauce as it bubbles and thickens and let cook for a couple of minutes.
Remove meatballs, add to a bowl and pour remaining sauce on meatballs. Serve as an appetizer or over a bed of rice.