Beef Bulgogi Lettuce Cups with Sesame Sauce

For the Beef Bulgogi:
2 Place the beef in the freezer for 4 to 6 hours to partially freeze – this will make it easier to slice. Remove the beef from the freezer and slice it very thin with a sharp knife. Transfer the steak to a shallow bowl or baking dish and set aside.
3 In a blender, combine the onion, pear, kiwi, garlic and ginger. Blend on high speed until smooth. Pour the marinade over the beef. Add the coconut aminos, vinegar, sesame oil, fish sauce, honey, if using, salt and pepper. Toss gently until well coated. Cover and refrigerate for 30 to 45 minutes maximum.
4 Preheat a large cast-iron or carbon steel skillet over medium-high heat. Working in batches so as not to overcrowd, drain most of the marinade and add the beef to the pan. Cook, undisturbed, until slightly brown, around 2 minutes. Stir gently until the beef is just cooked through, around 2 more minutes. Transfer to a bowl and repeat with the remainder of the meat. Garnish with sesame seeds and serve with the lettuce, green onions, rice, kimchi and sesame sauce.
For the Sesame Sauce:
7 In a bowl, combine the mayonnaise, kimchi juice, sesame oil and honey. Stir until smooth, taste and adjust with kimchi juice as desired. Cover and refrigerate for up to 5 days.