NHL's Mark Letestu Crushes Mustard Packet on Bench During Game

NHL vet Mark Letestu didn't need a hot dog to enjoy his mustard on Thursday ... 'cause the Winnipeg Jets center downed that yellow stuff straight outta the packet!!

The 34-year-old Canadian turned heads when he was spotted chuggin' some mustard on the bench during the Jets' preseason game against the Edmonton Oilers ... leaving a lot of people wondering what the hell was going on.

Turns out ... it's all in the name of SCIENCE!!! 'cause apparently, mustard has some ingredients like turmeric and vinegar that help prevent cramps.

Hey ... we get it. It's preseason. A lotta dudes are probably cramping up on the ice out there after the offseason. But, it doesn't make it any less weird to see the guy straight-up dowinin' mustard like that.

It's actually not the first time this has been a thing ... NFLer Kerryon Johnson was spotted chugging mustard on the sidelines during his Madison Academy high school game back in 2014.