Miniature bamboo.

Young reed shoots look exactly like bamboo shoots.

Photo: Phragmites australis 9.Young reed (Phragmites australis) shoots with last years yellow stalks.

Photo: Phyllostachys bissetii 2.And here's a bamboo shoot picture.

I expect the reed is too small for "miniature bamboo shoot" foods, though. The root of common reed is edible, but I haven't gotten around to that yet.