Choose young squash with tender skin. Wash and cut in 1/2-inch slices. Water blanch 3 minutes. Cool promptly, drain and package, leaving 1/2-inch headspace. Seal, label and freeze. Grated zucchini (for baking) — Choose young tender zucchini. Wash and grate. Steam blanch in small quantities 1 to 2 minutes until translucent. Pack in measured amounts into containers, leaving 1/2-inch headspace. Cool by placing the containers in cold water. Seal, label and freeze. If watery when thawed, discard the liquid before using the zucchini.