What is "blooming onion"?

A blooming onion is a popular appetizer that consists of a whole onion that has been cut in such a way as to resemble a flower, battered, and deep-fried until crispy and golden brown. The dish is believed to have originated in the United States in the early 1990s and gained popularity in the chain restaurant Outback Steakhouse. To create a blooming onion, the top of the onion is sliced off and then deep cuts are made all the way around the onion, creating a "petal" effect. The onion is then coated in a seasoned batter and fried until crispy. Blooming onions are often served with a dipping sauce, such as a spicy mayo or a tangy barbecue sauce, and are a popular appetizer at sports bars and casual dining restaurants.