<human>:  What is the history behind the renowned delicacy caviar?
<bot>: Caviar is a type of luxury food that is made from sturgeon roe and is highly esteemed in cuisine worldwide. Its history is believed to span back many centuries, beginning with the ancient Greeks and Romans who enjoyed using sturgeon eggs as a delicacy. It was said to be served at the tables of the Tsars in Russia, and it gained fame and popularity in Europe during the 17th and 18th centuries. Traditionally, it is often served as an accompaniment to a variety of dishes such as sushi, and it has become a staple in haute cuisine. Caviar is valued for its unique, salty flavor and high price, making it a coveted luxury item.