Ground elder is a famous invasive, and most sensible people would never dream of growing it on purpose. But I live in the high desert and tend to be fairly fearless about moisture-loving invasives, on grounds that if I get tired of them I can withhold water and watch them disappear. Therefore, I let some variegated ground elder grow under a plum tree and harvest it aggressively for salads.
It needs to be harvested young, before the leaves unfurl, and at this stage it has a strong celery-parsley flavor that I find appealing, and a lovely crisp texture. The furled young leaf at the top is pretty, but the stem is the real vegetable, so pick it as close to the ground as possible. Toss in a mixed salad, or arrange artistically on top.
When the leaf opens out it becomes tough and is no longer desirable eating. I have read that it also produces nausea in some people at this stage, so it’s definitely to be avoided.
If you live in a wetter climate, you may want to confine ground elder to a large pot, because it can get out of hand in a hurry.
Because each individual leaflet is small, I never get enough to cook, but I imagine that it would be good in stir-fries.
Be cautious with invasives, but don’t rule them out completely if your natural conditions will prevent them from spreading. And if you live in an area where it would be irresponsible to introduce ground elder, help solve the problem. Find a naturalized patch and start foraging.