Cut 1700 grams beef rib fingers in half to make them more manageable.
Add 1 tablespoon vegetable oilto a large heavy-bottomed pot such as a Dutch oven, and brown the beef on both sides in batches.
After removing the last batch of ribs, add 75 grams scallions, 20 grams garlic, and 20 grams ginger to the oil and fry the aromatics until they’ve started to brown.
Use a paper towel to soak up the excess oil.
Return the ribs to the pot and add 2 cups sake, ½ cup gochujang, 3 tablespoon soy sauce, 2 tablespoons rice vinegar, and 2 tablespoons dark brown sugar. Bring the mixture to a boil, cover with a lid, and lower the heat to maintain a gentle simmer.
The rib fingers will render a lot of fat, so use a skimmer to remove it periodically.
The ribs are done when a fork passes easily through the meat. This will take 2 to 2 ½ hours.
Remove the ribs from the pot and skim off as much fat as possible.
Strain the braising liquid through a sieve into a large pan.
Boil the braising liquid until it is thick and glossy.
Add the remaining 1 tablespoon rice vinegar, braised rib fingers, and glaze with the sauce.
I like serving these with rice, but you can also pull the beef and make sandwiches.