HP Sauce is a brown sauce originally produced by HP Foods in the United Kingdom, now produced by the H. J. Heinz Company in the Netherlands. It was named after London's Houses of Parliament.

HP Sauce has become an icon of British culture. It was the best-selling brand of brown sauce in the UK in 2005, with 73.8% of the retail market.

HP Sauce has a tomato base, blended with malt vinegar and spirit vinegar, sugars, dates, cornflour, rye flour, salt, spices and tamarind. It is used as a condiment with hot and cold savoury foods.

The original recipe for HP Sauce was invented and developed by a local grocer, Frederick Garton. He registered the name H.P. Sauce in 1895. Garton called the sauce HP because he had heard that a restaurant in the Houses of Parliament had begun serving it.

In June 2005, Heinz purchased the parent company. Heinz announced plans to switch production of HP Sauce from England to its European sauces facility in the Netherlands, only weeks after HP launched a campaign to "Save the Proper British Cafe".

The announcement prompted a call to boycott Heinz products. The move, resulting in the loss of approximately 125 jobs at the Aston factory, was criticised by politicians and union officials.

These plans were confirmed on 23 August 2006 and the factory at Aston ceased production on 16 March 2007. A week later a "wake" was held at the location of the factory.

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