Puree Pear and 1/2 of the white onion in food processor with Apple juice. Then put in large bowl. While processing, slice other half of white onion into thinly sliced slivers.
Add Garlic, Green onion, Soy sauce, Brown sugar, Black pepper, and Sesame oil to the bowl and mix well.
Add in thinly sliced onions, carrots, and beef to bowl. Mix well and get everything evenly coated. Place in a bag or covered bowl and marinate over night.
Cook in pan over medium heat tell beef is cooked and juice is almost gone. Traditionally you would place Bulgogi on a lettuce leaf and with some rice in a wrap style. Otherwise you could just serve it with Rice.