This screenshot captures Buckingham Palace Gin as listed for sale on the official website of the Royal Collection Shop.

LONDON - Britain's royal family has begun selling dry gin infused with lemon, verbena, hawthorn berries and mulberry leaves collected from Queen Elizabeth II's gardens at Buckingham Palace.

Queen Elizabeth's favourite tipple is a gin and Dubonnet, though she drinks in moderation

The "small batch" gin is on offer for 40 pounds (US$50) a bottle from the Royal Collection Shop, but only for delivery in the United Kingdom.

"Hand-picked botanicals from Buckingham Palace's exceptional garden have been combined to create this unique and flavoursome gin," the bottle says beside a picture of the queen's London palace.

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"For the perfect summer thirst-quencher, the recommended serving method is to pour a measure of the gin into an ice-filled short tumbler before topping up with tonic and garnishing with a slice of lemon," the site says.

Elizabeth's favourite tipple is a gin and Dubonnet, though she drinks in moderation.