01 -
Pour the hot syrupy mix into a clean glass jar or bottle, pop the lid on tight, and let it chill on the counter until cool.
02 -
Let everything bubble gently for around 10 to 15 minutes with the stove set to medium-high. Give it a stir now and then until it feels syrupy. Fish out the vanilla pod if that's what you used.
03 -
Stir in the sugar, vanilla seeds and pod or a bit of vanilla extract, plus all your lemon juice and zest right into the strained juice.
04 -
Push the hot cooked mix through a mesh strainer into another pot, really squeeze out all the tasty juice you can get. Toss the leftover rhubarb or save it to use later.
05 -
Dump your chopped rhubarb and water into a big saucepan. Get things hot on medium-high and let them bubble till the rhubarb totally softens, about 10 minutes.
06 -
Chop up your rhubarb stalks into little bite-sized bits after trimming off the ends.