In a VERY LARGE saucepan, bring buttermilk, sugars, and butter to a boil over medium heat. Cook for 1-3 minutes depending on how thick and carmelized you want it.

Remove from heat and whisk in soda and vanilla. It will bubble up a lot, which is why you need such a large pan. As it cools the bubbles will go away.

Serve over pancakes, waffles and french toast or just grab a straw and drink it down. It's that good!

Store in an airtight container in the fridge for up to few weeks.

Makes about 1 quart.