1cupblueberriesfresh or frozen (thaw first if using frozen)
1cupblackberriesfresh or frozen (thaw first if using frozen)
1cupraspberriesfresh or frozen (thaw first if using frozen)
In a medium saucepan over low heat, heat syrup and butter until butter is melted.
Stir in berries and heat to boiling, stirring continuously. Reduce heat to medium and continue cooking and stirring for 5 minutes. The mixture will remain thin while it's hot.
Remove from heat. Place a heat-proof fine gauge strainer over a medium heat-proof bowl and pour hot syrup mixture into strainer. Press mixture through strainer with a heat proof spatula or spoon to remove seeds. Discard seeds and any remaining pulp.