According to user OrchidHibiscus, who claims to be a shift manager at a restaurant in Glasgow, Scotland, any additional ingredient added on to an existing menu item is referred to as "grill order." For example, the employee says, a Big Mac with no pickle would be considered a "grill order."
To order off the secret menu — which the employee clarifies was not officially developed by McDonald's — just ask for additional ingredients.
"Order one and the workers might not know it by name ... but if you explain what it is, and are willing to pay for all the ingredients, it's just another 'grill order' that we can make up," writes OrchidHibiscus.
The employee referenced Secret Menu items like the Land, Sea and Air Burger ("Big Mac, Filet-O-Fish, & McChicken All in One") and the crudely named McGangbang ("A McChicken Sandwich inside of a McDouble") as potential food mashups that customers can order ingredients for.
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