Technically, it's probably illegal for a steakhouse to cook a product brought in by a patron. They will probably do it for you anyways but I believe it violates the health code. You can also try calling a week or so in advance and asking if they will provide halal meat for your meal. My guess is that a high-end steak house will have a way to get a high quality halal product from their purveyors and probably do it occasionally. Let us know how it goes!