... you need to think about blanching.
Blanching is basically taking the produce and boiling it or steaming it BRIEFLY so that the enzymes in the produce that encourage decomposition are inactivated. As soon as the veggies are picked, these enzymes start to break down the vitamins and sugars in the produce. This process isn't halted by freezing, it's just slowed down. So, you can freeze some perfect green beans and open them up a month later only to discover they are pale, mushy and slightly gross.
To stop this deterioration, you need to blanch the produce. It's a simple process: you get some water boiling and either briefly boil or steam SMALL, manageable portions of the veggies for a very short time (each vegetable has a suggested time limit - more on that in a minute). Then you take that batch and transfer it to a bowl or pot of ICY COLD water (which stops the cooking process). Drain the veggies, pat dry and when they're pretty much dry you put them into your freezer bags for freezing.
Blanching definitely improves the taste, texture and smell of frozen products. It also makes frozen veggies last a lot longer in your freezer. They retain their 'just-picked' colour, and more importantly they retain more of their nutritional value. Blanched veggies retain their Vitamin A (lost when frozen without blanching) and also minimizes the loss of the B Vitamins and Vitamin C.
Any vegetable that is cooked or preserved (as opposed to eaten fresh) will lose some of its nutritional value in the cooking. But blanching your veggies before freezing makes sure that you aren't losing any nutrients in the PRESERVATION. So, you might lose some vitamin content when blanching, and perhaps a bit more when cooking them later in the winter (unless they are cooked as part of something else such as frozen corn in chili or beans in soup where the vitamins get absorbed into the cooked meal) but this loss is not much different than the losses experienced in cooking fresh produce. The point is that at least the veggies aren't losing nutrients while sitting in your freezer.
I prefer to steam blanch my vegetables (I only steam veggies for cooking, too, as I feel that they lose less of the nutrients than they do in boiling water). I have a stainless steel steamer that sits in my pots over an inch or two of water. I don't find steam blanching to take any more time than boiling, and I think that the veggies retain better colour when they're steamed.
In either process, you will need some kind of strainer to get the veggies out of the hot water / steam and then transfer them to the ice bath (which is basically a pot of cold water with ice cubes in it, although there are more complicated ways to make one). If you're doing a few batches, you need to check the temperature of the ice bath and add more cold water when the water gets too warm (the point of the ice bath is to halt the cooking process so you want to drop the temperature of the veggies quickly).
You can freeze veggies in plastic container (washed yogurt containers, for example) or in freezer bags. I prefer freezer bags because I can press most of the air out, so I find that I get fewer ice crystals on my produce once they're frozen. Once the contents are thawed and dumped out, I wash the bags in the laundry machine and reuse them, so they're less wasteful than they might otherwise be. Lable the stuff... it's surprising how similar frozen green things can look in the freezer.
When it comes time to use your frozen veggies, remember that since they've been blanched, they are already partially cooked. You will need a lot less time to cook them after they're thawed than you would fresh veggies.
Blanching times for easy-to-freeze vegetables:
- Beans (green and yellow): Steam blanch for 3-4 minutes or boil for 2-3
- Carrots (cut into 1/4" cubes or slices): Steam for 4 minutes or boil for 2
- Carrots (larger chunks): Steam for 5 min or boil for 3
- Corn (whole cobs): Blanch 3 at a time. Steam or boil for 7 - 11 minutes, depending on size
- Corn (kernals): Blanch on the cob, 3 at a time. Steam for 6 minutes or boil for 4. Cool cobs, then cut kernals off the cob.
- Peas (green): Steam for 2 minutes or boil for 1 1/2 minutes.
- Peas (snap or snow): Steam for 3 minutes or boil for 2
- Peppers (hot or sweet): Steam or boil for 2 minutes (although this is one vegetable that doesn't have to be blanched)
- Squash or pumpkin (cut up) Steam or bake until completely cooked
- Tomatoes: can be frozen like fruit
A lot of other vegetables can be frozen, but these are the most common (and suitable) vegetables for freezing.
Plan on freezing your veggies as soon as possible after you buy them (and ideally as soon as possible after they are picked). You will find that, generally speaking, the produce that you buy at a Farmer's Market (or farm gate itself) will be a lot fresher than anything you'd buy in the supermarket. So if you're planning on putting some veggies down, go to the Farmer's Market early, grab whatever you like that looks fresh and tasty, bring it home and freeze it right then (but make sure you leave yourself some for dinner).
Fresh vegetables (with the exception of root vegetables like carrots, parsnips, potatoes, and to some extent beets) are obviously out of season during our long Canadian winters. If you are in the mood to eat beans in January, therefore, you are looking at either buying fresh beans (grown in California or Mexico or Chili or China, under who-knows-what conditions) that are very expensive, or frozen vegetables (which, if you buy them at your supermarket, may have been grown in China or California or New Zealand). Vegetables that are frozen when they are fresh are a VERY healthy choice, especially when compared to veggies that were picked unripe, transported in ripening gas, and left to sit on a display stand for days. By freezing your own (or at least part of) your winter needs in terms of vegetables, you will know where your food came from (and who handled it) and you will be able to have delicious veggies during the dark, cold months. Plus, you'll have the satisfaction of independence and self-reliance.