USC's Lincoln Riley Grilled Over Latest Kitchen Nightmare

Lincoln Riley can cook opposing defenses with his playbook, but he still needs some serious help when it comes to preparing food ... 'cause USC's head football coach is getting ripped apart AGAIN for his most recent kitchen creation.

Two years after he was mocked to hell for his awful-looking Easter brisket, the leader of the Trojans' sideline still hasn't learned his lesson ... and this time, his victim was an innocent tuna.

The 39-year-old coach shared a pic of a cooked fish caught by his WR coach Dennis Simmons (sorry to bring ya into this, coach) this week ... and a lot of his followers struggled to figure out what it was by the time he was done with it.

"Did you smoke a red velvet cake?" one confused Twitter user said.

"Feed the team this before the Oregon game," another user added. "Will clear a locker room out faster than Rona."

There's more -- "IDC if this is filet mignon or tuna. I don't trust this dude on the grill any more than I do with a defense."

"You can afford a private chef, for the love of god get one," a pretty logical tweet pointed out.

Some users were trying to help out by suggesting different temperatures and using other seasonings... but ultimately, the general consensus is the dude is pretty much hopeless.

Despite the backlash, it doesn't seem Lincoln will be feeding into the hate anytime soon ... and who knows -- maybe you'll see him on a future episode of "Worst Cooks in America!!!"