Quality: Select small to medium, firm turnips or parsnips that are tender and have a mild flavor.

Instructions:

Wash, peel and cut into 1/2-inch cubes.

Water blanching: Water blanch for 3 minutes. Cool promptly in cold water and drain. Pack into containers, leaving 1/2-inch headspace. Seal and freeze.

Source:

So Easy to Preserve, 6th Ed., 2020