Step 1

Combine the rhubarb, maple syrup, lemon zest, and water in a small saucepan. Bring to a boil over medium-high heat, then reduce heat to medium or medium-low, so that a steady simmer remains. Stir frequently, and cook until the rhubarb has broken down and thickened, about 15 minutes. You may need up to 30 minutes of cooking time.

Step 2

Remove the rhubarb sauce from heat. It will continue to thicken as it cools, but you can serve it immediately if desired.

Step 3

Spoon over vanilla ice cream, and enjoy!