Mix together ground turkey, chopped onion, garlic, soy sauce and egg. Mixture will be very wet. Plug in griddle and heat to 350, or you can fry them in a pan with a little cooking spray to keep from sticking.
divide meat mixture into 6 portions and pat out to about 1/2 thickness. They will be about 4 to 6 inches round. They shrink up a lot so I pat them a little larger than the buns diameter. fry about 5 min and flip and fry on the other side about 5 minutes or until done.
For sauce: mix together mayo, mustard, tabasco and about 1/2 to 1 cup chopped fresh basil. Place Burger on bun top with sauce, and add desired veggies. MMMM.