Not much changes at the perfect pre–Brooklyn Museum eatery, Tom’s: The lemon-ricotta pancakes slathered in a medley of butters are still heavenly, cherry-lime rickeys maintain an old-soda-shoppe allure, and on weekend mornings, a line of hungry diners of all ages—munching on cookies and orange slices proffered by friendly staff—stretches around the block. Get here early for a timely eggs and coffee fix.