posted 12 years ago
Nearly all edible leaves are better when young, and dock is no exception. The leaves get bitter and tough later in the season, like in most plants. Some of this bitterness can be simmered out, though, if you are going to use it as greens. If you use it raw in a salad, it will have a bitter tang to it if they are older leaves, but that can go okay in a salad if you want some interest from otherwise bland greens.
Just like spinach and sorrel (which dock is related to), the leaves have oxalic acid which makes it bitter or sour to some. Some like to boil it twice after changing the water once and draining it well the second time. This to me is unnecessary and wasteful of water-soluable nutrients, but I do like to simmer it until it is tender, then stir fry them a few minutes in butter and seasoning, by itself or with other ingredients. I also cream the greens sometimes or melt cream cheese with them, just like I do with spinach. Another good use is in a cream soup. It is a better spinach than spinach any day! It also is a nutritional powerhouse that spinach and most other greens can't match.
Anything with oxalic acid, even Popeye's spinach, as well as rhubarb and beet greens, can be too much of a good thing if eaten in excess. It can interfere with calcium absorption. The sourness or bitterness is from the oxalic acid, so if it isn't bitter, the oxalic acid isn't strong. Moderation in all things is the key, in any case...even an excess of plain good water can be bad for your health, lol.