Vermouth is a fortified wine that is flavored with various botanicals, such as herbs, spices, and roots. It is commonly enjoyed as an aperitif in Castelldefels and is often served over ice with a slice of orange or lemon. Vermouth can be enjoyed on its own or used as an ingredient in cocktails, such as the classic Martini. It has a complex and aromatic flavor profile that makes it a popular choice among locals and visitors alike.