Start by cooking the ground beef seasoned with a touch of black pepper in a large skillet over medium heat, breaking it apart until fully browned, about 5 minutes.
Add butter, sliced bell peppers, chopped garlic, sliced shallots, and ginger to the skillet, stirring and cooking everything together for 2 minutes.
Pour in tamari, then stir in the gochujang and ginger juice along with 1/3 cup of water; let it simmer until the beef gets coated with the sauce, 2 to 3 minutes.
Stir in maple syrup or honey and cook a further 1 to 2 minutes to let the beef caramelize before removing from heat, then toss with toasted sesame seeds.
While the beef cooks, combine chopped cucumbers with salt, chili flakes, ginger juice, and chopped green onions in a bowl and let it rest for 5 minutes to marinate.
To serve, spoon the beef and pepper mixture over bowls of rice, add the refreshing cucumber salad on the side, and sprinkle with chopped peanuts; add spicy mayo if you like and enjoy!