1. Peel the bananas and weigh the net result. 
2. Add an equal weight of sugar and the lemon juice. 
3. Finely chop the ginger. Mix it into the banana mixture. 
4. Simmer for about 30 minutes, stirring often, until the sugar is completely dissolved. The consistency should be fairly thick. 

Finishing

1. Pack into sterilized jars. 
2. Close tightly and place upside down until completely cooled. 
3. Label and cover with parchment paper.