I can't say how authentic this is since I have never eaten its equivalent at a restaurant. I just know that I thought it was really great.
from Serious Eats
I let this marinade for at least 24 hours, and that seemed to be the key to the pork's tenderness.
1 lb pork tenderloin, trimmed of silver skin and excess fat
1/4 c soy sauce
3 cloves garlic, minced
2 tbsp light brown sugar
2 tbsp gochujang
2 tbsp mirin
2 tbsp sesame oil
1 tbsp crushed ginger root
1 tsp red pepper flakes
2 green onions, minced
1 small onion, thinly sliced
Place the pork in the freezer until it firms up, about 1 hour (or if frozen, thaw until it is still slightly firm). While the pork is in the freezer, combine the soy sauce, garlic, brown sugar, gochujang , mirin, sesame oil, ginger, red pepper flakes, and green onions in a small bowl.
Remove the pork from the freezer and slice into pieces 1/8 inch thick. Place the pork and sliced onion in a large Ziploc bag, pour in the marinade and seal. Toss to evenly distribute the marinade, then open and reseal the bag, removing as much air as possible. Place in the refrigerator and let marinate for at least one hour to overnight.
bacon, egg, & kimchi sandwich
adapted from Closet Cooking
makes 2 sandwiches, can be easily multiplied for more
4 slices bacon
1/2 c kimchi (drained and chopped)
3 tbsp mayonnaise
1 tbsp gochujang
2 English muffins (lightly toasted)
1/2 c shredded Cheddar cheese
shredded romaine in a korean sesame vinaigrette, optional
Cook bacon until crisp (we like a cast iron skillet), then drain on paper towels. Pour off all but a couple tablespoons of the bacon fat. Add kimchi to the skillet and saute until a bit caramelized. Carefully crack one egg at a time into skillet, cook over medium until bubbling, then flip and cook just until set, 1-2 minutes.
Mix mayonnaise and gochujang in a small bowl. Sprinkle bottom of muffin with cheese, then top with fried egg. Add bacon, kimchi, and romaine salad, if using. Slather top muffin with gochujang mayo mixture, join the halves, and enjoy!