You guys are terrible. Except for Malkore, of course.
Just don't make a deal out of it..behave as if you're choosing to eat the way you do because that's what you enjoy. That makes you look confident, and decisive. It's not that hard to be sneakily healthy. I do it all the time.
Get the dressing on the side (or not at all..most people won't question a simple "I don't like dressing", even if it is a lie). As malkore said, get the vegetables steamed if possible, and that's about the best you can do..if the vegetables are steamed and you don't eat a hell of a lot of dressing, or any bread crumbs, then it's not really much of a cheat meal..unless you eat disgustingly large amounts.
I agree with calcium on not eating less than her..unless she's swedish (yes, that was a jibe at nordic women, get some), or she knows you eat 5-8 meals a day. (You do eat 5-8 meals a day, don't you?) Though, really..it's not a terribly big deal. Don't get all neurotic about it. Unless she's some kind of a yeti, you'll be probably be okay.
Or, the other option is to simply admit it's a cheat and just enjoy your steak meal how you like (as long as it fits in with your calorie total for the day).