Prepare your outdoor grill for direct grilling over medium heat.
Saute' the chopped onion with butter in a skillet over medium to low heat. Cook until onion begins to brown, approximately 5-7 minutes.
In a medium bowl, using your hands, mix together the ground turkey, celery, garlic and buffalo wing seasoning mix, just until blended. Next, mix in the cooked onion. Shape into 6 very flat patties.
Brush the grill rack liberally with vegetable or canola oil prior to cooking. Place burgers on hot grill; cook 5 minutes, or just until the meat loses its pink color throughout, turning over once. (Burgers should reach an internal temperature of 170 degrees F.).
OPTIONAL: To turn up the flavor and the heat a notch, in a medium bowl, whisk together the hot sauce and melted butter. While the burgers are cooking, baste them liberally with this mixture.
On the grill or in a toaster, lighlty toast the rolls/buns. During the last minute of cooking, add the crumbled blue cheese to each burger and cover to melt.
To serve, place the lettuce, tomato slices and pickles on the roll/bun bottom; if desired, drizzle the hot sauce and butter mixture over the burger before serving, Cover with roll/bun tops.
Cook's Tip: In small bowl, stir mayonnaise (1/4 cup), sour cream (1/4 cup), crumbled blue cheese (1/2 cup), vinegar (2 teaspoons), and Worcestershire (1/2 teaspoon) until blended. This blue cheese sauce makes about 3/4 cup and is a delicious accompaniment to carrot and celery sticks when serving this spicy turkey burger.
Cook's Tip: For an added treat when toasting your rolls and buns, combine melted butter with garlic and brush on the insides prior to setting them on the hot grill.