The Chinatown Duck Burger at Cindy’s Backstreet Kitchen has long been one of my favorite burger variations in the Bay Area (by variation, I mean a non-beef burger). And what’s not to like? Freshly ground duck, grilled and smothered with an umami-rich shiitake mushroom ketchup, and garnished with just a touch of arugula for color. The duck burger is accompanied by a side of Chinese-style mustard sauce for good measure, and of course, french fries. An up-valley classic, for sure.