- In a large bowl, combine turkey, blueberries, ginger, lemongrass and black pepper; mix well.
- Form mixture into 4 patties.
- Brush soy sauce on both sides of burgers.
- In an oiled skillet over medium-high heat, grill patties until cooked thoroughly, about 4 minutes each side.
- Serve on buns with lettuce, sliced red onion and blueberry ketchup.
* Peel away woody outer layer from the bottom portion of the lemongrass stalk; mince inner flesh.