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1
Make the marinade:
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2
Pour the oil into a 2-cup measure. Add the soy sauce. Squeeze the lemon juice through a small strainer (to catch the seeds) into the measuring cup. Add the Worcestershire sauce, mustard and black pepper. Whisk to blend well. Peel and coarsely chop the garlic; stir it into the oil mixture.
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3
Place the beef cubes in a 1-gallon freezer-weight, zipper-top plastic bag. Whisk the marinade again to recombine. Pour the marinade into the bag with the beef. Seal the bag and gently shake to coat the meat with marinade. Place the bag flat in the refrigerator to marinate 8 to 24 hours. Turn the bag over once halfway through, or more often if possible.
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4
Place about four cubes on each skewer (depending on the size of the cubes), leaving a little space between the cubes for even cooking. Place the kebabs on a plate or tray. Discard the marinade. (The prepared kebabs may be refrigerated, covered, up to 6 hours).
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5
Turn on a gas grill to medium-high. Grill the kebabs, turning frequently, to desired doneness. Cooking times will vary depending on the size of the meat cubes and the grill. (In our testing, we found 7 to 8 minutes produced medium-rare meat for 1 1/4-inch to 1 1/2-inch cubes). Serve at once.
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Note: If using bamboo skewers, soak them in water for at least 30 minutes before assembling the kebabs, so the skewers don't scorch on the grill. The number of skewers you will need depends on the size of your meat cubes. Cubes typically weigh about 1 ounce each, and we serve four cubes of meat per person for average appetites.
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7
Start to finish: 15 minutes preparation, plus 8 to 24 hours unattended marinating time and 7 to 8 minutes grilling time.
