In your slow cooker, combine 1 pound of ground beef with ¼ cup of soy sauce, 1 tablespoon of grated fresh ginger, 3 cloves of minced garlic, and 1 tablespoon of gochugaru. Stir well to ensure all ingredients are mixed thoroughly.

Cover your slow cooker and set it to low heat. Allow the beef mixture to cook for 4 to 5 hours, or until the beef is tender.

In a mixing bowl, combine thinly sliced cucumbers, ½ cup of rice vinegar, 1 tablespoon of sugar, and a pinch of salt. Toss gently and let them sit at room temperature for approximately 30 minutes.

Once the slow cooking time is up, stir in 1 tablespoon of sesame oil into the beef mixture. Allow the beef to rest, covered, for about 10 minutes.

Warm your tortillas in a dry skillet or microwave. Spoon the beef mixture onto each tortilla, then top generously with quick pickled cucumbers. Enjoy your tacos!