Step 1

Combine both ingredients in a pot and bring to a boil over medium-high heat. Reduce heat and simmer for 10-15 minutes (stirring occasionally) until thick enough to coat the back of a spoon (liquid will have evaporated leaving just over 1/2 cup of thick concentrated vinegar).

Step 2

Let cool completely and then use or pour into a jar. Store in an airtight container in the fridge for up to 2-4 weeks.