an example of edible underground stem?

Detailed description of edible plant stems AsparagusThe edible portion is the rapidly emerging stems that arise from the crowns in the early spring.BambooThe edible portion is the young shoot (culm).BirchTrunk sap is drunk as a tonic or rendered into birch syrup, vinegar, beer, soft drinks, and other foods.BroccoliThe edible portion is stem tissue, flower buds, and some small leaves.CauliflowerThe edible portion is proliferated stem and flower tissue.CeleryThe whole plant is edible including the crisp petiole (leaf stalk) and the fleshy taproot.CinnamonThe bark is used as a spice.FigThe edible portion is stem tissue. The fig "fruit" is actually an inverted flower with both the male and female flower parts enclosed inside stem tissue.GarlicThe edible portion is predominantly swollen leaves with a bit of stem.Ginger rootThe edible portion is a branched underground compressed stem also referred to as a rhizome.KohlrabiThe edible portion is an enlarged (swollen) stem. It is a member of the cabbage family and is white, green, or purple in color.LeekSimilar to other members in the onion family, the edible portion is swollen leaves with a bit of stem.Lotus rootThe edible portion is a stem modified for underwater growth. Buds and branches are visible on the vegetable sold as lotus root.