Brewing saffron with hot water is a common method of brewing saffron. But brewing saffron with ice is suggested recently which is told it will make it more tasty and colorful.
After reading this article brew saffron with ice. Pour saffron in a glass jar then add same amount of ice cubes to saffron and let the ice melt in environment temperature.
People who have experienced this method say this method is more satisfactory.