Brussels sprouts were indeed named after the capital city of Belgium. They originated, along with other members of the cabbage family, in the Mediterranean. However, they were cultivated in Europe near Brussels beginning only in the Middle Ages.
If you’ve ever seen them before harvest, it’s quite interesting. They grow like baby cabbages around a central, fibrous stalk. Trader Joe’s sells them on the stalk when they are (briefly) in season.
In any case, people love this healthy, low-calorie appetizer/side dish these days in the USA. Serve them with my spicy, creamy sriracha aioli sauce for an extra kick. They are great for a party, a weekday side, buffet or vegetarian treat.