Who pickled these tsukemono?
Pickled things are Japanese pickled vegetables! Or tsukemono if you've already been eating yummy pickled ginger, daikon, and umeboshi!
You already learned 漬ける meaning "to pickle" so just take the る off there shove the け into the kanji. You read it still, but it's hiding. It probably shrunk in the pickling process. Stick some things (もの) on there are you know the reading! Not bad! By the way, sometimes you'll see this word spelled like 漬け物 too.