Bring the liquid to a boil, then let it simmer for around 5-10 minutes, or until the rhubarb is starting to fall apart. It should only just hold its shape. Allow the mixture to cool, then store in an airtight container in the fridge or use right away!
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Notes
Make sure to take out any particularly tough strings, but don't completely skin the rhubarb. The pink skin gives it a beautiful color.
Older rhubarb will be more tart, so depending on the age of the rhubarb, you may need to add more sugar.
Make absolutely sure to remove and discard the leaves. Unlike many other bright-stalked leafy greens, the leaves on rhubarb are toxic!
Feel free to add fruits to the pot! I love adding in chopped sweet apples or sliced strawberries to boost up the sweetness.