Rosy-Peach and Banana Jam

3 1/4 cups mashed peaches (about 2 pounds)
12 cups bananas (about 3 medium)
1/2 cup coarsely-chopped maraschino cherries
2 tablespoons lemon juice
12 (1 3/4 ounce) packages fruit pectin
6 cups sugar

Combine the peaches, bananas, cherries, lemon juice, and fruit pectin in a large Dutch oven; stir well. Place over high heat and bring to a boil stirring frequently; quickly stir in sugar.
Once it comes back to a boil, boil for 1 minute or until mixture reaches 220°F on a candy thermometer, stirring constantly. Remove from heat and skim off surface with a metal spoon.
Quickly ladle into hot sterilized jars, leaving 1/8-inch head space. Cover at once with the lids and screw on bands tight.
Process in boiling water bath for 5 minutes.