Prepare a hot charcoal fire or preheat a gas grill. In food processor or blender, combine stuffing and water; process until stuffing becomes coarse crumbs. Transfer to large bowl.
Add turkey, pecans, minced onion, barbecue sauce, and salt to stuffing and mix until well combined. Shape turkey mixture into six patties about 3/4-inch thick. Brush red onion slices and both sides of burgers lightly with oil. Grill burgers 6 to 7 minutes each side or until cooked through. Grill onion slices about 4 minutes each side.
To serve, place one lettuce leaf on each serving plate; top with a burger, and a slice of tomato and grilled onion.
Nutrition information per burger as served-300 calories; 21g protein; 18g carbohydrates; 1g fiber; 17g fat; 2g saturated fat; 66mg cholesterol; 514mg sodium.