Healthy London Broil

This one comes from Men's Health and clocks in at 297 calories. Serves 5. I cooked mine for 10 minutes each side. That seemed to work well for me. I also marinated mine overnight. Most of the flavors were subtle (except for the vinegar) so I would definitely recommend overnight.

Ingredients
1 1/2 pounds lean top round roast, trimmed of fat
1/2 cup balsamic vinegar
2 tablespoons brown sugar
1 tablespoon extra-virgin olive oil
1 teaspoon worcestershire sauce
1/2 teaspoon chopped dried or fresh parsley
1/4 teaspoon ground black pepper
1/4 teaspoon onion powder

Directions
Use a sharp knife to score the roast diagonally about 1/4" deep. Cut again in the opposite direction to create diamond scores. Do this on both sides of the roast. In a large zip-top bag, combine the rest of the ingredients. Add the beef and seal the bag. Marinate in the fridge for at least 6 hours (overnight is even better). Adjust the oven rack to the highest level. Preheat the broiler. Place the roast on a broiler pan. Discard the marinade. Broil the roast for 6 minutes on each side, or until a thermometer inserted in the center registers 160°F for medium doneness. The outside should be crusty and sizzling and the inside slightly pink. Remove from the oven and transfer to a cutting board. Tent with foil and allow the roast to rest for 10 minutes before slicing. This makes for a juicier London broil. Make very thin slices diagonally across the grain. Tip: While broiling, crack the oven door slightly (about an inch). This will keep the oven coils activated and red hot, preventing them from cycling off. This beef is just as tasty when cooked on the grill. Preheat the grill to medium-high and grill the roast for 6 to 7 minutes on each side.