Heat oil in a large ovenproof skillet over high. Sprinkle pork with 3/4 teaspoon salt and pepper. Add pork to pan; cook 5 minutes, turning to brown on all sides. Add pears and onion to pan, breaking up onion wedges with a spoon. Place pan in oven.
Bake at 500°F for 8 minutes or until onion is tender and a thermometer inserted in thickest part of pork registers 140°F. Remove pork from pan; let stand 3 minutes. Cut into slices.
Add remaining 1/4 teaspoon salt and vinegar to pan, scraping pan to loosen browned bits. Return pork to pan. Sprinkle with cheese.
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