1/4 cup fresh lime juice
3 1/2 cups firm ripe bananas, diced
2 1/4 cups sugar
1/2 cup water
Peel bananas and dice directly into lime juice. Stir with a wooden spoon. Keep stirring as you dice each banana into the lime juice to prevent darkening.
Measure sugar and water into a saucepan, and stir to dissolve sugar as you bring syrup to a boil. Cover tightly for the first 2 minutes (so the steam will wash sugar crystals from side of saucepan) then uncover, add bananas (with lime) and boil over low heat for about 30 minutes or until thick. Stir often to prevent sticking, especially during last 10 minutes.
Jam is done when a spoon scraped across bottom of pan leaves a track that closes slowly, or when jam mounds while stirring.
Fill hot, sterilized jars jam mixture, leaving 1/4 inch head space.