It's long been the stuff of urban legend: does McDonald's really have a secret menu for customers wanting burgers and other fast food with a difference? The answer can finally be given and it's a "yes". An anonymous store manager in Scotland answering questions on Reddit gave the full lowdown on the secret menu.

"You can order from the 'Secret Menu'," she stated.

The 24-year-old manager from Scotland revealed that customers in the know can order up the likes of the dubiously named "McGangbang" – a McChicken sandwich tucked inside a double cheeseburger.

The manager said that staff in most branches of the chain may not recognise the items by name, but are able to produce them from a description.

Other favourites for aficionados of saturated fat are the "Land, Sea and Air Burger", which includes beef, chicken and fish, and the "Mc10:35", a brunch sandwich, which combines breakfast and lunch items. Then there is the "McLeprechaun Shake", a chocolate and mint combination available only in March, as well as the cheaper and lower calorie "Poor Man's Big Mac".

"The items on the 'secret menu' weren't invented by anyone officially at McDonald's," she said. "It's just a random persons' guide to burgers you could potentially 'hack' at McDonald's."

The manager also advised that McDonald's customers who want a healthy meal should choose the meat.

"The items marketed as 'healthy options' are worse than you'd think," she said. "Deep fried chicken goes into the wraps, the veggie patties are deep fried, and the salad dressings are filled with rubbish. The meat however, is good and is freshly grilled. It's 100% local beef flank. The milk is from 'organic' farms. The breakfast menu uses real free range eggs."

She said that customers who want to cut down on air miles should avoid the chicken because it is pre-cooked, breaded and frozen in Thailand, before being flown to McDonald's premises in different countries the world.

"Don't order the grilled chicken," she added. "It's horrible frozen chicken that we defrost and steam and it's a bit gelatinous."

The anonymous manager was answering questions during an AMA (Ask Me Anything) session on Reddit.