Parmesan Buffalo Burgers with Balsamic Ketchup

We enjoy bison/buffalo meat. Skipped making the balsamic ketchup and instead sauteed the red onion until just starting to brown then added some balsamic vinegar to that and simmered until reduced/absorbed by red onion. Great way to add the balsamic flavor in less time. Used my regular favorite ketchup.

These were tasty but not particularly extraordinary. I was a bit disappointed in the balsamic ketchup - it took a long time to make and then it just tasted like really thick pasta sauce to me.