korean pearor asian pear, peeled and flesh carved into flower shape (optional)
Steep the dried omija in cold water overnight. Strain the berries and discard them (keeping the liquid). Add some honey or sugar if preferred. Optionally, you can also add some Korean / Asian pear pieces. Serve. (You can refrigerate the tea then serve cold too.)
Essentially, each omija tea comes with instructions on the package, so follow what the package says. Though, I read that when omija is boiled or brewed in hot water, it will bring out the sourness and bitterness too much. So it is highly recommended that you brew omija in cold water.