Bill Murray played guest bartender at 21 Greenpoint’s opening, pouring shots to support his son, Homer Murray, one of its amiable owners. The bar section of this Greenpoint restaurant is a great watering hole, and in back there’s an intimate, secluded dining room. The menu changes daily and is meant for sharing. Selections include thin-crust margherita pizza, hand-cut tagliatelle with grilled zucchini-garlic sauce and seafood stew rife with oysters, clams and squid. Sean Telo (ex-Extra Fancy) executes the food and oversees a special Sunday meal that creatively incorporates leftovers to reduce food waste.