Place the meat in the freezer for 1 – 2 hours to firm it up. In the meantime process the garlic, pear, onion and ginger to smooth puree.
Slice the beef against the grain thinly, about 4-5mm. Place it in a bowl or a zip lock bag together with the puree; add the other bulgogi ingredients except the sesame seeds and mix in well, stirring the meat around in the bowl or squishing it about in the bag. Chill for at least an hour and up to overnight.
Prepare the spiced mayo by mixing all the ingredients together in a small bowl. When you’re ready to cook prepare the lettuce and garnishes so that everyone can build their own bulgogi parcel or kebab.
Heat up a cast iron pan or a heavy skillet over high heat. Transfer the meat into a colander and shake it about to get rid of some liquid. When the pan is hot, add the meat with the remaining marinade and stir fry until most liquid has vanished and the meat starts to brown around the edges. Sprinkle with the sesame seeds and keep the meat hot. Toast the pitas.
To eat, either load a pita, kebab style, with torn lettuce, meat, garnishes and sauce; or place some meat, rice and garnishes on a lettuce leaf, fold in and wrap up the edges to form a small parcel. The lettuce parcel should be eaten in one bite!
