Submitted by: Mabel from Chicago, IL
Mix the ginger, garlic, red pepper flakes, turmeric, and salt into a thick paste. Rub thoroughly onto the flank steak strips. Set aside in the refrigerator for at least 2 hours.
Mix rice wine vinegar with sugar. Pour over cucumbers and tomatoes and toss well. Set aside in the refrigerator for at least an hour.
Thread the flank steak strips onto the skewers. When the grill (or broiler) is hot, grill or broil on each side for 2-4 minutes deciding on desired doneness.
You might want to wear gloves when rubbing the spice paste onto the beef, unless you want the turmeric to stain your fingernails.