Blackberry Trouble

 I was at my local farmers market and bumped into a friend who informed me that there is going to be a bbq at The Compound tonight. (The Compound is the affectionate nickname for a row of rental homes and apartment buildings on 12th Avenue whose residents enjoy an abundance of eating, drinking, and socializing. Stop by; it's cool. Bring bubbles.) I volunteered to take care of dessert and bought all these blackberries. Naturally I am going to do a thorough perusing of Foodista, but I thought I would also use the blog to solicit advice. Here's what I know and my parameters: They are a bit tart and I would like a simple preparation so I can spend my time at The Compound chitty-chatting rather than slaving away in the kitchen. Help! Please leave your suggestions in the comments. (And I apologize if you thought this post was going to be about smart phones rather than fruit.)