Chocolate Cherry Jam

I've been experimenting with chimerical jam recipes to try to create a working Black Forest jam. This is the closest I've come to what I want - let me know what you think!

• Ready In: 2 hrs
• Serves: 8

Ingredients

• 6  cups  prepared  fruit (black cherries)
• 3  unsweetened chocolate squares
• 4  cups granulated sugar
• 1 (8 ounce) box  Sure-Jell
• 1⁄2 teaspoon margarine or 1⁄2 teaspoon butter

Directions

1. Pit the cherries if necessary, then chop them up. Crush the remains thoroughly, 1 cup at a time. If using frozen berries, use both liquid and solids; they all were part of the original fresh berry. Measure 6 cups of crushed fruit into 6- or 8-quart heavy saucepan. Break the chocolate squares into smaller pieces and add them to saucepan.
2. Measure sugar into separate bowl. Mix 1/4 cup sugar from measured amount with pectin in small bowl. Stir pectin-sugar mixture into fruit in saucepan. Add butter. Bring quickly to full rolling boil and boil exactly 1 minute, stirring constantly. Remove from heat. Skim foam and ladle into pint or half-pint jars, leaving 1/4 inch headspace and process 10 minutes in boiling water canner.