Preheat your grill to between 300°F and 350°F.
Whisk together the vinegar, oil, garlic, Cajun Creole, and optional crushed red chili.
Slice the tops off of your tomatoes, remove the hard core section if needed. Dip the tomatoes into the oil mixture to coat on all sides.
Grill the tomatoes, cut side down over direct heat, for 5 minutes, or until they’re becoming tender, basting with the balsamic mixture.
While the tomatoes are grilling, combine the crumbs, feta and basil.
Flip the tomatoes and brush liberally with the balsamic mixture, season with salt and pepper then grilling for another 2 to 5 minutes. Top with the feta mixture and allow it to heat through.
Serve immediately as an appetizer or with your meal.