By Brittany Tiplady When I call Paul Grunberg for our interview it’s obvious that he’s in the throws of a lunch rush. “I’m so sorry, can I call you back in 45 minutes? 30 minutes?” he asks, raising his voice amongst the fray of voices, and dishes clanging. Less than half an hour later, we resume. I’ve been doing this job for a while, and I’ve gotten used to the usual shtick when interviewing a very busy person; it can be frustrating at worst, and tricky at best to capture the attention of your subject when their entrepreneur brain is focused elsewhere. I expected to have to fight for Grunberg’s attention over the phone, but to my surprise he was warm and pleasant and delightfully attentive. Much like his restaurants. If you’ve ever been to one of Grunberg’s establishments, you’ll agree that it’s fair to say the man is kind…