Onion sprouts are actually miniature scallions that the onion seed produces. In most of the cases, the sprouts are roots, but in case of the onions, they are shoots. This kind of plants are part of the alliums family, which includes all kinds of valuable seeds. Shoots are basically the plants that grow above the soil and the onion sprouts are one among the most popular species of shoots. The onion sprouts basically have the same taste like the mature onion and the same specific odor.