Step 1

Combine blackberries, sugar, lemon juice, and salt in a saucepan. Toss to coat and let sit for 5 minutes.

Step 2

Bring berry mixture to a boil over medium-high heat. Reduce heat to medium and simmer until sauce has reduced and thickened slightly, 15 to 20 minutes. Cool slightly and serve warm, or refrigerate for later use. Mixture will thicken further as it cools.