Slice pork crosswise into 1/2-inch-thick medallions. Slice medallions into strips, about 3 x 1/4 inch. Heat 1 tablespoon oil in large nonstick skillet over high heat. Add the pork strips, working in batches to avoid crowding if necessary, and half the garlic; stir-fry until pork is browned, about 5 minutes. Remove to plate and keep warm.