Diners wanting to tuck into a restaurant's £12 gourmet burgers were told they had to sign a disclaimer.
Diners were advised to have the meat "medium or above"
Managers at the Marriott West India Quay in east London's Docklands asked customers to complete the form if they wanted rare or medium-rare meat.
The chef on duty also had to sign the paper which waived the restaurant's liability for food-poisoning.
Customers were urged to have their burgers cooked "medium or above" instead to reduce the risk.
A spokesman for Marriott said they stopped using the forms on Monday but warned customers they had the rare or medium-rare burgers "at their own risk".
The chef and customer had to sign the form
She added: "We should point out that we have full confidence in the meat products that we serve.
"However, customers who choose to have their burgers cooked rare or medium rare do so at their own risk."
Nick Scade, chairman of the Restaurant Association, said: "It strikes me that some corporate person has got their knickers in a twist.
"I certainly haven't heard of anything like this before - and it's not something I'll be doing in my restaurant.
"You've got to have a bit of common sense somewhere in life and if a customer wants to order raw meat they have to accept some responsibility for the risk they are taking."