This unique aspect of beet greens gives them a calcium: magnesium ratio of 1.6:1, in comparison to the ratio in turnip greens of 6.2:1, or the ratio in mustard greens of 9.2:1. (whfoods.org)
I'm responding to your use of turnips with greens by suggesting other rarely used veggies. (garlicandzest.com)
I'm sure it would be just as good with turnip greens, kale or rutabegga greens. (addapinch.com)