Queen Elizabeth II, who became the longest-reigning monarch of Britain (check the graph here) on Wednesday, loves scrambled eggs with smoked salmon and a grating of truffle.

Known to be a frugal monarch, she, however, has never ordered fresh truffles. She enjoys them only during Christmas when they are gifted to her. Former personal chef to the queen, Darren McGrady revealed the details in his memoir “Eating Royally.”

Meanwhile, former royal chef Owen Hodgson said that the Queen likes marmite with mushrooms and crust-free sandwiches, Hello reported. The chef said that for a perfect tuna sandwich, they cut the loaf lengthwise, then butter both sides, add tuna-mayonnaise mix, thinly sliced cucumber and a dash of pepper.

Apart from sandwiches, the queen loves to tuck into fillets of beef and venison from Sandringham and Balmoral made into Gaelic steak, served with a sauce of mushroom, cream and whisky. Also she likes strawberries from Balmoral, and white peaches from her greenhouses at Windsor Castle.

Two days a week, Elizabeth flips through the menu and tick marks her preferred dishes. After attending Sunday mass, she indulges in a “well-done roast."

The queen loves her tea, and has a cup of Twinings English Breakfast in the morning with milk and no sugar, with Marie cookies served in bone china. Afternoon tea comes along with small servings of chocolate perfection pie or chocolate biscuit cake, made with McVitie’s Rich Tea biscuits.

The 89-year-old monarch has a sweet tooth and loves chocolates and puddings. Elizabeth and her family celebrate their birthdays with chocolate ganache sponge cake, a dessert that was created by Queen Victoria’s chef.

The queen, meanwhile, marked her epoch-making day with a quiet dinner along with the Cambridges, who came to Balmoral on Tuesday, People reported. She also spent the day attending an official engagement with her husband Prince Philip in Edinburgh, where she traveled by train.

She reportedly made a rude hand gesture to her husband on the train, which Prince Philip found hilarious. Her “unruly reflection” was caught in the glass window that was noticed by Mirror UK readers.

The slideshow above takes a look at how the Queen and the country marked the historic day.

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1233 Britains Queen Elizabeth steps off the royal train at Newtongrange railway station
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Britain's Queen Elizabeth arrives at Newtongrange railway station, in Scotland, September 9, 2015. Queen Elizabeth officially opened the new Scottish Borders Railway on the day she became Britain's longest reigning monarch. REUTERS/Andrew Milligan/Pool
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1258 A flotilla sails down the River Thames to celebrate Queen Elizabeth becoming the longest-reigning British monarch
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Queen Elizabeth II