Bok choy, usually cut in thin cross-sections. Chinese cucumber, cubed or cut in thin two-inch strips. Snow peas, whole. Onion, coarsely chopped but not still in sections. Broccoli, cut into small florets.
Canned shoots are fine.
Water chestnuts, sliced. Canned water chestnuts are fine. Baby ears of corn, either whole or cut in sections. Canned baby corn is fine. Chop the veggies and separate them for cooking.