What is a spanish onion?

Spanish onions are a type of sweet onion that are slightly larger and milder in flavor compared to other varieties. They have a thin yellow skin and white flesh, and are typically used raw in salads, salsas, and sandwiches. Spanish onions are also commonly used for caramelizing due to their high sugar content. They are available year-round in most grocery stores and are a versatile ingredient in many recipes.