Nettles, they are my favourite. There are a lot of nettles here and there in my yard, they yield many harvests per summer. I've been freezing them - first briedly boiled then cut into small pieces. But now I'm thinking if I could just grow some of them indoors, to have a fresh harvest all winter long...

And an early spring tasty snack is rowan leaves, when they haven't yet fully opened. The taste resembles almond, but the season is over very quickly - mature leaves are too bitter to eat, and I haven't tried any way to preserve them.