Popcorn shoots (aka popcorn microgreens) look a bit like tender, long, bright yellow grass. This yellow color is due to being grown in special dark greenhouses, where preventing the plants from photosynthesizing keeps them from developing green chlorophyll (not unlike white asparagus).
Popcorn shoots are grown from a particular variety of popcorn kernels, and have a rather sweet corn flavor with a slightly-sour, grassy finish evoking wheatgrass. Their texture is moist yet crunchy, almost like bean sprouts.