The noticeably bitter taste of turnip greens has been linked by researchers to its calcium content. On an ounce-for-ounce basis, turnip greens contain about 4 times more calcium than a much less bitter-tasting cruciferous vegetables like cabbage. Even in comparison to mustard greens, turnip greens contain about twice the calcium content. High calcium content is not the only reason for the noticeable bitterness of turnip greens, of course. But it may be an important contributing factor. While the commercial food industry has sometimes tried to breed out the bitter-tasting constituents from turnip greens, this practice doesn't make sense if you want to maximize your nourishment from this cruciferous vegetable. A much healthier approach would be the use a recipe and cooking method that brings out the delicious potential of turnip greens in a flavor-blended way.