Combine soy sauce, ½ cup dark brown sugar, ½ cup white sugar, grated onion, ginger, and garlic to a large saucepan.
Bring mixture to a boil, and then reduce heat to low and simmer for 15 minutes.
Pour the remaining dark brown sugar and white sugar, and honey into the saucepan.
Bring to a boil (the mixture will rise and foam), when it doubles in size, remove the pan from heat, and cool.
