Edible portion of brussels sprouts is

The edible portion of brussels sprouts is a Small head or bud.
The Brussels sprout is a member of the Gemmifera cultivar group of cabbages (Brassica oleracea), grown for its edible buds. The leaf vegetables are typically 1.5 - 4.0 cm in diameter and resemble miniature cabbages. The Brussels sprout has long been popular in Brussels, Belgium, from which it gained its name.
Raw Brussels sprouts are 86% water, 9% carbohydrates, 3% protein and negligible fat.