Hot sauce is one of the sauces in Mixelland it is used to put on Meat of Nixel as Flain like that very much.
Trivia: It is used to put on Meat of Nixel this causes the brain of Mixel explode like the Rokit sauce makes the head of Mixel explode.
It was originally thought to be Salt-sauce but this was removed Apparitions but this sauce was seen in Episode Beach day.
The show of Flain.
Outer space (part 1) (mentioned)