Rough chop the onion and Asian pear and throw it in a food processor.. puree until smooth. I tossed the minced garlic in there at the end, hit it with a few puree-pulses, and saved it for later.
In a small bowl (or a measuring cup like I did), add the gochujang, Worcestershire, ketchup, salt, and brown sugar. Save that for later as well.A
In a medium/large pot over medium-high heat, add the sesame oil and garlic. Toast the garlic until it is golden brown.
Add the puree blend to the pan. Cook it down until it is reduced by maybe a quarter or so - just make sure them flavors are well incorporated.
Add in that gochujang blended bowl, and bring it to a simmer. Let it stay for about 5-10 minutes and remove from heat - let it cool to room temperature before we're coating.
In a baking dish, coat them ribs with the marinade. Cover the baking dish and refrigerate overnight. I used most of it, but I saved some to add to the ribs at the end.
Fire up that RecTeq to 225F, and when hot, place it on the grates. Plan for at least a 4 hour cook.. pull it when it "looks" and "feels" done. Or around 190F or so.
When you know they're close to done, layer on the remaining marinade sauce and top with some green onion/cilantro.
Remove the ribs from the grill, sprinkle some sesame seeds on there, put a slice on, and eat 'em up!