Finely mince the garlic cloves or run them through a garlic press. Add the garlic to the mixing bowl.
Chop the onion and add it to the mixing bowl.
Add the breadcrumbs, dried dill, dried oregano, black pepper, and salt to the mixing bowl. Using your hands, mix the ground turkey with the ingredients that are in the bowl until they are uniformly incorporated into the ground turkey.
Pinch off a quarter size piece of meat and microwave it on high for 25 sec. Let it cool briefly and taste it. Adjust the salt and spices if you think it is needed. The amounts of the Penzeys dried dill and oregano I used resulted in a robust Greek flavor. Brands and shelf life of dried spices can vary. You are looking for a gyro vibe.
Chop the roasted red peppers and add it to the meat mixture along with the crumbled feta cheese and mix into the meat mixture.
Form the turkey mixture into six burgers. Wrap the burgers you will not be using in plastic wrap then place them in a freezer bag and stick them in the freezer for later use.
Heat your outdoor or indoor grill. If you will be cooking the burgers on the stove top, get the skillet hot.
Place the burgers on the grill or in the skillet and cook until they are done. I used a Cuisinart Deluxe Griddler with the plates set at 400℉ and they were done in 2 min. Remove as soon as they are done (165 - 170℉).
Building the Sandwiches
Spread tzatziki on the bottom halves of the buns.
Place a lettuce leaf on the tzatziki and then add the burger.
Top the burger with a slice of tomato and a nice size dollop of tzatziki. Add the top of the bun. Serve and enjoy.
Notes
Nutritional data for just the burger is at the very bottom under Nutrition.Nutritional data for a burger on a 647 bun with lettuce, tomato and tzatziki is below. Cal 276.6kcal | Carb 34.1g | Protein 28.7g | Fat 12.5g | Sat. Fat 7.7g | Sodium 570 mg | Fiber 12.5g | Tot. Sugar 5.7g