01 - In a medium saucepan, add mixed berries and granulated sugar or maple syrup.
02 - Heat over medium, stirring gently until berries release juices, about 3 to 4 minutes.
03 - Incorporate fresh lemon juice and optional vanilla extract, stirring to combine.
04 - If a thicker consistency is desired, stir in cornstarch slurry and simmer while stirring for 2 to 3 minutes until slightly thickened.
05 - Remove from heat and serve warm atop pancakes, waffles, oatmeal, yogurt, or ice cream.