Stir together first 4 ingredients. Cover and chill until ready to serve.
Combine 2 tablespoons lime juice and next 4 ingredients in a large, heavy-duty zip-top plastic bag. Add steak, and seal, turning to coat. Refrigerate 1 hour.
Remove steak from marinade, and discard marinade. Grill over high heat (400° to 500°) 7 minutes on each side (for medium rare) or to desired degree of doneness. Let stand 5 minutes before slicing. Top with chilled cilantro butter.
I made this with the accompanying shrimp recipe and also served with the cilantro butter. It was easy (I think I spent 15 minutes or less prepping the marinade) and so yummy. I either forgot the sugar or used white sugar (I can't recall but I know I didn't get my brown sugar out ... :/ we had a hard time stopping ourselves from eating the whole thing. Even my 1 year old kept going and saying "nummy nummy tummy!" Cilantro butter is a nice addition that brings this up to the 5th star.
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