Glace icing, also known as royal icing, is a versatile and easy-to-make icing that is commonly used to decorate cakes, cookies, and pastries. It is made by combining powdered sugar with a small amount of liquid, such as water or lemon juice, to create a smooth and glossy icing. Glace icing can be tinted with food coloring and piped onto baked goods to create intricate designs. It dries hard and is perfect for adding a decorative touch to your baked creations.