The fruit known for having a hard outer shell and is often used in desserts is the coconut. Coconuts have a tough, fibrous shell that protects the edible white flesh and the water inside. The versatility of coconuts is notable, as they can be used in various culinary applications, including desserts like coconut cream pie and coconut macaroons. The sweet, rich flavor of coconut adds a tropical touch to dishes, and its texture makes it a popular ingredient in both sweet and savory recipes.