Slices: To freeze wash and cut zucchini in 1/2 inch slices. Place in boiling water for 3 minutes. Start timing immediately, do not wait for the boil to return. Cool in cold water. Drain and freeze. If you wish to fry it in slices, freeze on cookie sheet and then package frozen. Dip slices in mixture and crumbs or flour before it thaws. For casseroles, freeze cubes or small slices of zucchini.