The Queen described a tin of 1950s Bloater Paste, a herring fish pâté, as "disgusting" on a visit to a replica of the original Sainsbury's store in central London.
Her Majesty was shown shopping baskets which demonstrated how food tastes have changed since Sainsbury's first opened 150 years ago.
The supermarket opened its original store in Drury Lane in 1869, selling butter, milk, and cheese.
During her visit, the Queen also got the opportunity to see an original ration book from the Second World War, and reflected on her own experiences of food shortages.
She said: "As a Sunday treat we had some sweeties, but we were lucky we had a farm."