01 -
Mix together chopped rhubarb, water, and sugar in a big saucepan. Heat everything over medium and stir so the sugar melts.
02 -
Let it come to a slow simmer, then cook for about 20-25 minutes. Stir off and on until the rhubarb is super soft and begins falling apart.
03 -
Break out an immersion blender (or regular blender) and blend the mixture until it’s completely smooth.
04 -
Toss in the vanilla, lemon juice, and cinnamon (if you're using it). Let it simmer for 5 more minutes, letting it thicken up a bit.
05 -
Take it off the heat and let it cool. Spoon it into a clean jar, seal it, and pop it in the fridge to keep for about 2 weeks.