Topinambur (Tupinambá) i harvested kinda early (end of Nov.) to add to sweet Apfel-Nuss- and salty Kürbis-Kartoffel-strudel. (2€-coin for size comparison)
i also grow the red variety. usually, i harvest them around Feb. when they are biggest (and probably sweetest).
my favorite topinambur-application is grated into fruit salads btw.