<P> Beginning in March 2016 the company announced that it would move forward to sourcing its beef from cows that have not been treated with antibiotics . The chain did not announce a timeframe for the switch, but that it would move forward at an expedited pace . Part of the reason for the switch was that California passed a series of laws to ban the use of antibiotics in non-medical, prophylactic treatments . Additionally, several groups of consumer advocacy NGOs, led by CalPIRG, had been pressuring a number of restaurant chains to stop using meat raised with low - dose antibiotics . </P> <P> The bulk of the secret menu revolves around the burgers . In - N - Out's own website acknowledges the existence of this secret menu, publicizing "some of the most popular items" on what it calls the company's "not - so - secret menu ." </P> <P> "Animal Style" is one of the most popular "secret" styles; in addition to the standard toppings, Animal Style burgers include mustard fried onto each meat patty, pickles, grilled onions, and extra spread . "3 × 3" (pronounced 3 - by - 3), "4 × 4", or variations of "m" × "c", refers to a burger with a varied amount of meat patties, "m", and slices of cheese, "c": e.g. a burger with six meat patties and three slices of cheese is a "6 × 3". The In - N - Out "secret menu" section of the website only mentions the "3 × 3" and "4 × 4", which are registered trademarks of the company . </P> <P> Until 2004, In - N - Out accommodated burger orders of any size by adding patties and slices of cheese at an additional cost . However, on October 31, 2004, a group of friends ordered a 100 × 100 from a location in Las Vegas, Nevada, posting photos on the web of the burger . Once word got out of the incredibly large sandwich, In - N - Out management disallowed any sandwich larger than a 4x4 . </P>

What does animal style mean at in-n-out burger
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