Slice the cucumbers thinly on the diagonal, salt them, and squeeze out excess water.
Cut the beef into thin strips and season with sesame oil, salt, and pepper.
Stir-fry the beef in a pan until cooked through.
In a bowl, combine the cucumbers and cooked beef. Season with red chili powder, minced garlic, vinegar, sugar, and sesame oil.
Mix all ingredients well and serve on a plate.