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It seems like the rest of the sentence was cut off. However, based on what you've given me, I can try to complete it. Here's a possible answer: "...since I've had such a delicious steak at a restaurant." However, please note that the sentence you provided initially seems a bit incorrect grammatically. A more natural way to express the idea would be: "I haven't had a steak as delicious as that before. This is the first time..."