The only way to preserve eggplant is by freezing:

1.        Wash, peel if desired, and slice 1/3-inch thick. Prepare quickly, enough eggplant for one blanching at a time.

2.        Water blanch, covered for 4 minutes in one gallon boiling water containing 1/2 cup lemon juice (fresh or bottled).

3.        Cool, drain and package, leaving 1/2-inch head space. Seal in zip closure freezer bags and seal and freeze.

For frying -- Pack the drained slices with a freezer wrap between slices. Seal and freeze.
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