In a heavy stock pot, place the strawberries, mangoes, and pitted cherries. Add curry, chili powder and a pinch of salt. Using a potato masher, mash them by hand until they are crushed. You should have six cups of mashed fruit. If you do not, add the appropriate amount of water to increase the liquid to six cups.
Measure ¼ cup of sugar and mix it with the contents of the Sure-Jell. Sprinkle it into the berry mixture and set it on the stove and bring to a boil, stirring constantly.
When it comes to a hard boil (a hard boil is one you can't stir down with spoon) add the remaining sugar.
Continue stirring constantly and return it to a boil and when it comes back to a hard boil, continue boiling it for exactly one full minute. (Set a timer to make sure you get it for a exactly one minute).
Remove from the store & immediately ladle the jam sterilized jars. Place lids on jars, screw on tightly. Process in a hot bath for 10 minutes to seal the jars.