These turkey burgers are delicious as is, but they'd also be lovely with garlic aioli. Try serving them with BLT pasta salad with [smoked tomato bacon vinaigrette|https://www.healthy-delicious.com/2014/06/smoked-tomato-bacon-vinaigrette-recipe/" target="_blank].
Add the cucumber slices and garlic cloves to a small dish; cover with vinegar. Let sit at least 30 minutes.
Meanwhile, place the zucchini in a colander set in the sink or over a rimmed baking sheet. Season generously with salt and pepper. Let rest 15 minutes. Using your hands, gently squeeze out any excess water (don't go crazy, but the zucchini should be relatively dry.)
Use your hands to gently combine the turkey and zucchini; try not to overwork the meat. Divide into 4 patties.
Heat your grill to about 500ºF. Grill the turkey burgers for 8-10 minutes on each side, or until cooked through. Top each burger with Havarti and cook another 1-2 minutes, or until the cheese melts.
Lightly toast the hamburger rolls. Serve the turkey burgers and cucumber slices on the toasted rolls.