Homemade Barbecue Sauce

The challenge:  make a homemade barbecue sauce that’s not too sweet, that’s tangy-mustardy like a Memphis-style sauce, and can be put up using a boiling water bath.
I’m almost there.
I despise finding huge amounts of high fructose corn syrup in food, especially as the number one ingredient.  Before our preferred brand of store-bought barbecue sauce became [...]