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1
Trim excess fat from beef and slice very thinly across the grain. Transfer beef to a container.
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2
Place onion, pear, garlic, ginger, and sake in a blender or food processor. Blend until smooth and creamy. Add soy sauce, brown sugar, sesame oil, and black pepper. Pulse until marinade is well mixed.
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3
Pour marinade over beef. Gently massage beef for a minute or two. Cover and refrigerate for at least 1 hour or overnight.
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4
Mix vinegar, sugar, garlic, gochugaru, sesame oil, and salt together in a large bowl. Add cucumbers and green onions and mix gently by hand. Refrigerate for at least 30 minutes.
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5
Remove beef from refrigerator about 20 minutes before cooking.
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6
Heat canola oil in a cast iron pan over high heat. Cook beef in batches, one layer at a time, stirring until nicely browned, about 3 minutes. Avoid overcrowding beef, or it will end up steaming instead of browning. Transfer to a serving plate and sprinkle with sesame seeds.
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7
Heat tortillas in another skillet, about 1 minute. Transfer to a serving platter and cover to keep warm. Serve beef bulgogi with the tortillas, cucumber salad, and avocado, green onions, and cilantro as garnishes. Drizzle gochujang over tacos, mixing it with a little water if too thick.
