nettles. Yep, those same little darlin's that sting like hell if you brush up against them.
Turns out once they're tamed by a bit of steam, they're stingless and amazingly tasty. Kind of like a very strong spinach, probably something Popeye would have enjoyed.
I made up twelve bags of this super springtime tonic for the freezer, though I'll probably use two of them tomorrow, as I'm hungry for some spanakopita -- or, should that be nettle-kopita.