1/3 cup yellow prepared mustard
1/3 cup brown sugar
1/3 cup cider vinegar
This is really an oldie...it's found in lots of recipe requests for a mustard-based sauce but did not have its own forum recipe thread, so I've added it.
Later, there was a slight revision posted here, it just tweaks the measurements:
tvwbb.com
Danny Gaulden was a big name in barbecue when I started back in the late 1990s. This article talks about him and his restaurant Danny's Place in Carlsbad, NM.
1/3 cup brown sugar
1/3 cup cider vinegar
This is really an oldie...it's found in lots of recipe requests for a mustard-based sauce but did not have its own forum recipe thread, so I've added it.
Later, there was a slight revision posted here, it just tweaks the measurements:

DANNY GAULDEN'S RIB GLAZE
DANNY GAULDEN'S "New" RIB GLAZE - September, 1999 From http://www.dannysbbq.com/recipes.asp 1 cup brown sugar 1/4 - 1/3 cup mustard 1/4 - 1/3 cup apple cider vinegar (or beer) 1) Mix cold and bring to a simmer. 2) Let cool till ready to baste ribs. 3) If too thick, add more...

Danny Gaulden was a big name in barbecue when I started back in the late 1990s. This article talks about him and his restaurant Danny's Place in Carlsbad, NM.

Danny's Place - Carlsbad, New Mexico - Gil's Thrilling (And Filling) Blog
For some reason, national print and online publications and even the Food Network can’t seem to fathom that the Land of Enchantment has outstanding cuisine outside the shining pinnacles of Santa Fe and Albuquerque. To some extent the media may be justified in perceiving the City Different and...
www.nmgastronome.com