Heat griddle pan, large skillet or grill pan over medium-high heat.
Combine garlic and herbs in small bowl, and cover with vinegar and oil. Stir to combine.
Place meats in a bowl, season with salt and pepper and combine well with your hands. Form 8 small, 3-ounce patties that are thinner at center and thicker at edges for even cooking.
Grill meat 3 minutes on first side and 2 on the second side for medium. Serve on slider rolls topped with lots of chimichurri, diced tomatoes and onions.