He explained that the best burgers are made using tough cuts such as chuck, brisket or ribs so it's a waste of money for chefs to ground down the most expensive cuts and charge you more for it.
Why you should never order well-done meat:
Not everyone loves their steak cooked rare but James said you'll risk having a worse cut of meat if you ask for it well-cooked.
Unless you're elderly or pregnant, he says the chef won't take kindly to your request and will serve you thin or tough cut pieces of meat, taking little care over the cooking of it.
Why you should never order anything with truffle oil:
James says that you should avoid ordering anything with truffle oil on it.
He maintains that the chef often drizzles '20p worth' (40c) of imitation truffle flavoured oil onto your food and adds plenty on to the price as a result.
THE THREE MEALS YOU SHOULD NEVER ORDER
• A "fancy" burger
• Well-done meat
• Anything with truffle oil