Add all ingredients to a saucepan slicing bananas over the top. Bring to a boil over medium heat, stirring often to prevent sticking. Continue stirring and mashing your fruit to get a thick consistency; about 20-30 minutes.
Ladle hot jam into sterilized jars leaving 1/4 inch headspace. Using a chopstick or plastic knife, pop any air bubbles. Wipe rims spotlessly clean and place a sealing lid on top the jar. Place your lid and rings on finger tight and process in a water bath canner for 15 minutes for pint jars and 10 minutes for half-pint jars.
If jar lid seals it will easily keep for one year in a cool, dark place. If jar doesn't seal, place it in your refrigerator and eat within 3 months, or within one month of opening.