- 1Combine all of the ingredients in a small saucepan and stir. Place over high heat and bring to a boil. Once the mixture boils, reduce the heat to low and simmer until the rhubarb is falling apart and the color has bled into the syrup, about 20 to 25 minutes.
- 2Remove from the heat and, using a fine-mesh strainer, strain and discard the rhubarb solids. Let the syrup cool to room temperature, then transfer it to a resealable container and store in the refrigerator for up to 3 weeks.