Fantastic! I didn't have sherry on hand, so I had to substitute it with Marsala wine. Incredible results!
Wow this is totally awesome! I let my steaks marinate for a day then pan fried them. I'm sure they'd be great on the grill but it's 15 degrees out tonight and snowing and I wasn't that interested in finding out! The marinade is very sweet and not as mustardy-overpowering as the amount would indicate. A must try flip!