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at room temp.
With the exception of onions and peppers, most raw vegetables can not be frozen without being blanched first. Raw, unblanched vegetables that are placed directly in the freezer will loose their crispness and fresh flavor, and won't be good for much of anything except perhaps soup.
Lettuce
You can but it will not taste as good as the first thing unless it is strawberries or a cooked vegetable like corn or broccoli
Yes. Some freeze better than others. Some should not be frozen at all. Vegetables with a high water content like lettuce do not freeze well. Usually vegetables are blanched (slightly cooked) to kill enzymes that will cause them to go bad in the freezer so basically any vegetable you can't steam or boil for a few minutes shouldn't be frozen. All frozen vegetables will be softer after freezing than while raw and are best used in cooked dishes.
I am not sure of the certain vegetable but all veggies can be blanched (put into boiling hot water for one minute and the shocked cold with ice cubes and water) and frozen until ready for use
The thing if cooked frozen is that thing you cooked frozen.
I'm not positive, but I've never seen canned or frozen cucumbers:)
watermelon
Its mostly to brighten the color, but it also removes a little of the crunch. Blanching slows or stops the action of enzymes. Up until harvest time, enzymes cause vegetables to grow and mature. If vegetables are not blanched, or blanching is not long enough, the enzymes continue to be active during frozen storage causing off-colors, off-flavors and toughening.To Preserve Color And Flavor
Food which has been cooked can be frozen, even if it was frozen prior to cooking. BUT Frozen food which has been thawed, but not cooked, should never be re-frozen. Nor should food which was cooked, frozen and thawed.
Peas, like other vegetables, are canned or frozen at the peak of their freshness to preserve them. Canned peas are heated/cooked during processing and so are a darker drab green and a softer texture as opposed to frozen peas which are blanched to a bright green and close to raw. Frozen peas can be added to a dish at the last minutes of cooking/heating to preserve that color and texture.