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Kim Kardashian and Khloe Kardashian are throwing shade at their sister's cooking skills!

When Kourtney Kardashian tries and fails to make bishi, Kim and Khloe can't help but make fun of her.

In the exclusive bonus clip from this past Sunday's Keeping Up With the Kardashians, Kourtney is in the kitchen with Kim when she starts making some mistakes.

Kim then calls Khloe and tells her what's happening.

"If you only saw what's going on over here, she's ruining our bishi experience," Kim says to Khloe. "She doesn't know how to cook it."

Kim also tells Khloe, "It's thick as f--k! I'm gonna send you a pic. Bye."

She then sends Khloe a picture of Kourtney's creation and Khloe can't help but laugh.

Kim tells Kourtney, "She replied with crying faces saying ‘Stop! No!'"

See Kourtney make a mess in the kitchen in the video above!

Watch a brand-new Keeping Up With the Kardashians June 5 at 9 p.m., only on E!