Fast food enthusiasts across the UK have celebrated a major supermarket discovery, claiming a high-street product perfectly mimics McDonald's iconic Big Mac sauce. This comes as the burger giant launches its limited-time Secret Menu, which includes individual dipping pots of the famous sauce for 20p each.
The Secret Menu Sauce and the Supermarket Saviour
McDonald's rolled out its new Secret Menu on January 5, 2026, featuring a roster of returning and new items available for a short period. A standout addition for many fans is the chance to buy pots of the beloved Big Mac sauce separately. Available across UK branches, the 20p pots offer a direct hit of the signature flavour.
However, savvy customers are already planning for when the menu disappears. In a popular Facebook group, NewfoodsUK, a diner named Cheryl Bryant sparked excitement by pointing shoppers towards a Marks & Spencer alternative. She wrote that "The m&s burger sauces tastes the same & is £2 for a bottle." Her post was met with agreement from numerous other group members.
What is the M&S 'Big Mac' Sauce?
The product in question is Marks & Spencer's Special Burger Sauce, priced at £2 in M&S and Ocado stores. The retailer describes it as an American-inspired, tangy tomato and mustard sauce, flavoured with gherkins and dill oil, suitable for burgers, dips, dressings, or marinades.
The sauce has garnered impressive customer feedback, with 92 five-star reviews currently on its listing. Reviews strongly hint at the connection to the fast-food favourite. One customer stated it has a "relish taste which makes it taste better," while another explicitly said, "Tests just like Big M." A third devoted fan claimed, "it's the only burger sauce my family will ever purchase."
A Lasting Hack for Fast Food Fans
This discovery provides a potential long-term, cost-effective solution for lovers of the specific Big Mac flavour profile. While the McDonald's dipping pots are a novel, limited-time treat, the M&S Special Burger Sauce offers a permanent, supermarket-accessible dupe. For households looking to recreate the taste at home or simply save money, this money-saving food hack could be the answer long after the Secret Menu promotion ends.
The revelation highlights how supermarket own-brand products are increasingly rivalling the taste of famous restaurant and fast-food items, allowing consumers to enjoy their favourite flavours without the premium price tag or the need for a takeaway trip.
