Add chopped rhubarb, sugar, and water to a medium saucepan.
Bring to a gentle boil over medium heat.
Reduce heat and simmer for 10–15 minutes, stirring occasionally.
Cook until the rhubarb breaks down and the sauce thickens.
Remove from heat and stir in vanilla extract if using.
Let cool before serving—the sauce will thicken as it cools.
Recipe Notes
Adjust sugar depending on how tart your rhubarb is
Add strawberries for a sweeter, more balanced flavor
Great for pancakes, yogurt, oatmeal, or ice cream