Shelsky's Brooklyn Bagels, from the same people behind Shelsky's deli/appetizing store on Court Street, is a little counter-service spot in Park Slope where you can get some very good bagel and bialy sandwiches. While there’s nowhere to sit down, you won't mind eating yours standing up - or bringing it wherever you’re headed, if you can wait that long. Get one with gravlax, pastrami-smoked salmon, or pork roll.