In case you haven't tried it, this is from the Prevent and Reverse Heart Disease book by Caldwell Esselstyn. It is SO good! I use Ortalli balsamic vinegar, Inglehoffer mustard, and agave syrup. The "parts" are by volume, eg, tablespoons. My husband loves this!
3 parts vinegar
2 parts prepared mustard
1 part maple (or agave) syrup
( I also add 1.5 parts water)
Mix and dig in!