01 -
Chop rhubarb into small, even pieces. If using frozen rhubarb, thaw fully and drain excess liquid.
02 -
In a medium saucepan, add rhubarb, ketchup, brown sugar, balsamic vinegar, sriracha, smoked paprika, garlic powder, and salt. Pour in 120 millilitres water. Stir well to combine.
03 -
Set the pan over medium heat. Bring mixture to a gentle boil, then reduce heat to a simmer. Cover and cook for 15–20 minutes, stirring occasionally, until rhubarb softens.
04 -
Remove lid and stir in Dijon mustard. Simmer uncovered for an additional 2–3 minutes to thicken and integrate flavours.
05 -
For a smooth consistency, blend the sauce using an immersion blender in the pan. For a rustic finish, mash with a fork or potato masher.
06 -
If sauce is too thick, incorporate extra water one tablespoon at a time until desired thickness is achieved. The sauce should coat the back of a spoon but remain pourable.
07 -
Allow the sauce to cool completely before transferring to a jar or airtight container. Flavours intensify after resting overnight in the refrigerator.