Place all of the ingredients in a large pot and, over medium-high heat, bring it to a boil. You need a candy thermometer to check when the jam is done-- it makes life much easier. All you need to do is wait until the temperature reaches 221 degrees Fahrenheit, stirring a few times while you wait. If you don't have a candy thermometer, let the mixture come to a boil and let it go for about 8 minutes. When you put a drop of jam in a glass plate and put it in the freezer. If it gels, it is ready, otherwise boil for some more time and repeat the test.