Heat sesame oil in a large skillet over medium-high heat
Add ground beef and cook until browned, breaking it into crumbles
Stir in garlic and ginger, cooking until fragrant
Pour in soy sauce, gochujang, sweetener, and rice vinegar
Mix well and let simmer until sauce thickens and coats the beef evenly
Sprinkle in red pepper flakes for extra spice if desired
Remove from heat and stir in green onions and sesame seeds
In a separate bowl, combine cucumber slices with vinegar, sesame oil, sweetener, chili flakes, and salt
Toss well and let sit for 10–15 minutes to lightly marinate
Serve beef warm with cucumber salad on the side or layered together