Bunker is a youthful, beachy Vietnamese hangout, a surprise to find in a warehouse area between East Williamsburg and Bushwick. Whoever leads the way gets immediate bonus points for being adventurous. A cool party vibe inside complements the food, which is complex and exciting. Try the pho, grilled lemongrass short ribs and summer rolls with wild prawns and roast heritage pork. Big, crunchy banh mi sandwiches (good for sharing) are filled with fried wild blue catfish, Vietnamese chicken sausage or, in a vegetarian version, mushrooms and basil-peanut pesto. Vegans will also find several options.