For the Marinade:
Combine the diced Asian pear, apple juice and garlic in a blender and purée on high speed until smooth. Transfer the purée to a heavy duty 1 gallon ziplock bag and add the soy sauce, sesame oil, sake, mirin, julienned onion and 2 tablespoons Bulgogi Spice. Mix well.
Add the thinly sliced meat to the marinade, making sure the pieces are well coated on all sides. Refrigerate and allow the meat to marinate several hours or overnight.
For the Stir Fry & Garnish:
About an hour before cooking, remove the bag from the refrigerator.
When you are ready to cook, preheat a wok over high heat and oil lightly. Working in batches, add a single layer of meat to the hot wok and stir fry until just cooked through, 3-4 minutes per batch.
Serve over rice and stir fried vegetables, garnished with green onions.
For added flavor, sprinkle on extra Bulgogi Spice at the table or add if you want to bump up the heat.
Notes:
Adapted from New York Times Cooking: Bulgogi Sliders with Scallion Salsa