colonies. The Carib Brewery, a Trinidad and Tobago brewery, produces a 'Shandy Sorrel' in which the tea is combined with beer. In Thailand, roselle is generally drunk as a cool drink, and it can be made into a wine. Hibiscus flowers are commonly found in commercial herbal teas, especially teas advertised as berry-flavoured, as they give a bright red colouring to the drink. Roselle flowers are sold as wild hibiscus flowers in syrup in Australia as a gourmet product. Recipes include filling them with goats cheese; serving them on baguette slices baked with brie; and placing one plus a little syrup in a champagne flute before adding the champagne — the bubbles cause the flower to open. In Dodoma, Tanzania the Roselle juice is brewed to make Roselle wine famous by the name of choya. Jam and preserves In Nigeria, roselle jam has been made since colonial times and is still sold regularly at community fetes and charity stalls. It is similar in flavour to plum jam, although more acidic. It differs from other jams in that the pectin is obtained from boiling the interior buds of the roselle flowers. It is thus possible to make rosella jam with nothing but roselle buds and sugar. In Burma, the buds of the roselle are made into 'preserved fruits' or jams. Depending on the method and the preference, the seeds are removed or included. The jams, made from roselle buds and sugar, are red and tangy. In India, Roselle is commonly made into a type of pickle. "Sorrel jelly" is manufactured in Trinidad. Roselle jam is made in Queensland, Australia as a home-made or speciality product sold at fetes and other community events. Herbal medicine (high blood pressure) A 2021 meta-analysis conducted by the Cochrane hypertension group concluded that currently the evidence is insufficient to establish if roselle, when compared to placebo, is effective in managing or lowering blood pressure in people with hypertension. An older meta-survey (2015) in the Journal of Hypertension suggests a typical reduction in blood pressure of around 7.5/3.5 units (systolic/diastolic). Both cite the need for additional well designed studies. Production China and Thailand are the largest producers and control much of the world supply. The world's best roselle comes from Sudan and Nigeria, b. Mexico, Egypt, Senegal, Tanzania, Mali and Jamaica are also important suppliers but production is mostly used domestically. In the Indian subcontinent (especially in