Our cravings for greasy potato skins and buffalo tenders only surface after particularly tough days at work (and four or five beers), but even generally, we’re against overly fussy bar snacks — even if they’re meant to complement a $15 martini. Our latest fixation is the made-to-order bacon-and-sea-salt pretzel ($8), best enjoyed dipped in apple mustard at the bar at Persephone (283 Summer Street, Boston, 617.695.2257). A soft, bready treat served still steaming, the pretzel satisfies our hankering for something salty yet refined. This is one snack worth getting in a twist over.