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["Remove stems from spinach leaves.", "Layer leaves on top of each other; slice crosswise into thin strips.", "In a medium bowl, combine spinach, water chestnuts, the 1/4 cup green onions, and 2 tablespoons of the teriyaki sauce.", "Trim fat from steak.", "Score steak on both sides by making shallow cuts at 1"" intervals in a diamond pattern.", "Place meat between two pieces of plastic wrap.", "Using the flat side of a meat mallet, pound lightly into a 10 x 8 inch rectangle.", "Remove plastic wrap.", "Sprinkle steak with salt and pepper.", "Spread spinach mixture over steak.", "Starting from a short side, roll steak up.", "Secure with wooden toothpicks at 1"" intervals, starting 1/2"" from one end.", "Slice between toothpicks into eight 1"" thick slices.", "Thread two slices onto each of four long wooden* or metal skewers.", "Brush slices with some of the remaining teriyaki sauce.", "For a charcoal grill, grill slices on the rack of an uncovered grill directly over medium coals for 12-14 minutes for medium doneness, turning once and brushing with remaining teriyaki sauce halfway through grilling.", "(For a gas grill, preheat grill and reduce heat to medium.", "Place slices on grill rack over heat, cover and grill as above.", ").", "Serve over rice, if desired.", "*Note: If using wooden skewers, soak the skewers in water for 30 minutes prior to using."]