Friday, October 16th, 2009 at
8:26 am
Blanching
Blanching is the scalding vegetables with steam or in boiling water. Blanching is necessary for most vegetables that you plan to freeze. Blanching vegetables before freezing locks in their peak colors and flavors and helps to preserve vitamins and minerals. It also slows the action of enzymes, which causes vegetables to ripen.
Blanching will also clean the surface of organisms and dirt. Wilting will also occur with blanching, this will allow for easier packaging of the product to be frozen.
Blanching time is extremely important, and is based on the on the size and vegetable to be frozen. Blanch to long and you will loose color, flavor and most importantly vitamins/minerals. If you under blanch you can cause more harm than good, this can stimulate the enzymes and increase there activity.
Water Blanching
Water blanching is the simplest method to use in your home. Special pots are made just for blanching, or you may just use a large pot with some type of wire basket to lower and remove the vegetables.
Fill your pot with one gallon of water per pound of vegetable. Bring the water to a rolling boil. Load the vegetables into your basket and lower into the pot and cover. Begin timing when the water returns to a rolling boil, if it takes longer than 1 minute to boil you have placed too many vegetables in the pot.
Steam Blanching
Steam blanching takes about one and a half times longer than water blanching. This method is recommended for broccoli, pumpkin, winter squash and sweet potatoes, though water blanching will also work.
Steam blanching requires a pot and basket that allows about 3 inches of space below the basket. Put 1 to 2 inches of water in the pot and bring to a rolling boil. Load the vegetables into the basket in a single layer. Place the basket in the pot and cover with a tight fitting lid. Timing begins as soon as the pot is covered.
Microwave Blanching
Microwave blanching is not recommended and may result in loss of texture, flavor and color.
Cooling
The vegetables must be cooled immediately to stop the cooking process. Remove the basket from the pot and place into cold water that is at most 60 degrees. Ice or running water is recommended to keep the temperature down. Cooling takes about the same time as blanching. When cooling is finished drain the vegetables well as excess moisture can lead to quality loss when freezing.