On top of that, the flavors don't really hit the way they should. The sauce leans into the sour buttermilk notes, and the aromatics get lost in the overt acidity.
Available at certain locations across the country, McDonald's hot mustard sticks to the herby, horseradish-adjacent end of the mustard flavor spectrum.
However, most diners typically visit McDonald's for something safe, and scorching the olfactory receptors with intense mustard flavors doesn't fit that bill most of the time.
The classic vinegary notes are there, but you also get plenty of cayenne pepper and garlic. It's a nice variation from the sweeter sauces on the McDonald's condiment menu.