If you wish your store bought mustard was a little sweeter or tart or..??? Why not make your own? You can with this recipe and adjust the flavors to whatever you like.
You might find this mustard to be a little thicker than store bought mustard but it has a very good flavor. Be very careful with turmeric; it will stain practically everything it contacts (counter tops, utensils) and is very difficult to remove.
Don't be afraid to experiment with additional or less vinegar and sugar to alter thickness, sweetness or tartness.