El Pollo Loco Sued for Allegedly Serving Bloody Mac and Cheese

El Pollo Loco made a gross mistake and tossed a crazy extra ingredient into a side of macaroni and cheese ... at least according to a new lawsuit.

A California woman claims she took her 3 kids to the chicken joint, and found a "foreign object" in her side dish. According to docs, obtained by TMZ, that object was a bloody alcohol swab. She doesn't say if it actually got in her boca.

In the suit, she's demanding $75k for herself and the minor children, who she says all sustained injuries to their health, strength and activity ... just like their Mom did.