I first encountered Uncle Louie G's in Midwood; a scoop of root beer sorbet (small; $2) had a slightly bitter taste of, well, roots, but the uneven, grainy texture was certainly interesting. Another time, in Bay Ridge, lemon sorbet (shown; large; $3) was much smoother and more refreshing.
Uncle Louie G's
376 86th St., Bay Ridge, Brooklyn
(one of many locations)
718-724-2120