Place steaks into large container. Combine onions, garlic, rosemary, red wine, sugar, and oil into food processor. 

Blend until smooth, and pour over steaks. 

Mix steaks well with marinade, make sure steaks are submerged in marinade. 

Cover with plastic wrap, refrigerate overnight. 

Remove steaks from marinade, pat dry with paper towels. 

Season both sides with salt and pepper. Grill on medium heat for about 8 minutes each side. 

Cook a little less for medium-rare and of course a little more for well done.  

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