Sweet onions are a type of onion known for their mild flavor and low sulfur content, which makes them less pungent than regular onions. Varieties such as Vidalia, Walla Walla, and Maui are popular for their sweetness and are often used in salads, sandwiches, and cooking. These onions are typically harvested in the spring and summer months, making them available fresh during that time. They are often enjoyed raw due to their pleasant taste, but can also be caramelized or grilled to enhance their natural sweetness in various dishes.