Blackberry Filling

Ingredients

• 64 ounce blackberries frozen thawed
• 1 cup butter 
• 0.7 cup cornstarch 
• 8  egg yolks 
• 4 cups sugar 

Equipment

• food processor
• bowl
• sieve
• blender
• dutch oven

Directions

1. Stir together blackberries and sugar; let stand 1 hour.
2. Process blackberry mixture in a blender or food processor until smooth.
3. Pour through a fine wire-mesh strainer into a bowl; press with back of a spoon to squeeze out juice, discarding solids.
4. Cook juice mixture and remaining ingredients in a Dutch oven over medium-low heat 12 minutes or until thick and bubbly. Cool. Cover and chill 8 hours.