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Nothing tastes better than sweet corn you freeze yourself, if you do it right. Following are suggestions:
- Use a "standard" sweet corn variety, such as Jubilee, instead of a "supersweet" variety, which may discolor once frozen.
- Harvest early in the morning, especially if weather is hot, to get peak flavor.
- Harvest the corn at its peak maturity. Immature corn is watery when cooked and over-ripe corn is doughy.
- Process rapidly after harvesting.
Processing:
When blanching sweet corn, use a 12-15 quart kettle. Use one gallon of water for each two to three cobs of corn. Bring the water to a rolling boil. Immerse the sweet corn in the water. Begin counting the blanching time as soon as you place the corn in the boiling water. Cover the kettle and boil at a high temperature for the required length of time. You may use the same blanching water two or three times. Keep the water level at the required height. Change the water if it becomes cloudy. Cool corn immediately in ice water. Drain the corn thoroughly.
Blanching time varies depending on the diameter of the corncob. The long blanching time is necessary to inactivate enzymes. A longer cooling time is needed to chill the cob. Not following directions promotes cobby off-flavors.
The following times are for blanching in 12 quarts of water
Midget and small ears of corn, (which are less than 1-1/4 inches in diameter) for 7 minutes and cool in ice water for 16 minutes. Drain well. Package in meal-size amounts. Medium to large ears of corn - if 1-1/4 to 1-1/2 inches, blanch 9 minutes, and if over 1-1/2 inches for 11 minutes. Cool in ice water 22 minutes. Drain well. Package in meal-size amounts. To freeze whole kernel corn, blanch the ears for 4 minutes and cool thoroughly in ice water. Cut the corn from the cob and package in meal-size amounts
When packaging, use good quality containers. Use moisture-and vapor-resistant wraps such as heavy aluminum foil, "freeze-and-cook" bags, plastic freezer bags, or freezer containers. The storage time for frozen sweet corn is 12-18 months at 0∞ F or lower.
(Information from University of Minnesota, http://www.extension.umn.edu/info-u/nutrition/BJ647.html)
(Continue to freeze corn off the cob:)
Cut the corn off the cob once the corn has been blanched and cooled so that the ears are cool to the touch. This takes a little feel so that you get enough corn without getting too much of the cob. This one is probably the most highly skilled of positions in the process and takes some practice.
Chill the corn. Once the corn is off the cob, put it into cake pans for a good chilling. Cake pans work well because they spread out the corn and transfer the heat nicely. To do this right, you'll need about 6-8 cake pans and a completely empty refrigerator. Put the pans into the freezer of an old refrigerator, then move them from the freezer down on to the shelves of the refrigerator as you get new pans filled. The warmest ones go in the freezer, and the cooler ones get moved into the refrigerator until you're ready to bag it.
Bag the corn. Once the pans of corn are completely cooled, you're almost done - all that's left is to package the corn up for final freezing. Use quart and pint Ziploc baggies. You don't want them totally full, just enough so you can close them easily and then flatten them out so they store easily. A quart baggie is about enough for one meal for 4-5 people, and a pint baggie works well for 2 people.
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