Spices serve several purposes in cooking and can be used to: Add Flavor and Aroma. Spices can transform a meal by adding a range of flavors, from a hint of sweetness to a kick of heat. They also give beautiful aromas that are often our first determining factor for whether we want to eat a meal or not. Enhance taste of food. Seasoning with spices can be intimidating if you’re not familiar with it but – like painting – with the right tools and practice, you’ll be cooking up a masterpiece in no time.