Izakaya Den is a lot of things. It's a tapas restaurant, a small plates restaurant, a sushi restaurant, a sake bar. It does Mediterranean food and Italian food, re-envisioned American bar food and really, really authentic Japanese food. And sometimes, it does all of these together on a single plate — to the delight and confusion and occasional horror of those fortunate enough to have happened into this South Pearl Street restaurant with the nondescript exterior and windows that look out on its always-busy sister restaurant, Sushi Den, across the street. You can get sashimi with real (and murderously expensive) wasabi here, skate wing and waffles, shumai dumpling and lemongrass vichyssoise, kobe beef sliders with foie gras, purple Peruvian frites and hoisin duck wontons. Izakaya is not only proud to call itself a fusion restaurant, but it stands as an avatar of what fusion could've been had such an intriguing culinary designation not been wrecked years ago by 10,000 restaurants all serving wasabi mashed potatoes and ahi tuna tartare.