(Jul)must was created by Harry Roberts in the early 1900's. Must is made of carbonated water, sugar, hops extract, malt extract, spices, colouring (E150) citric acid and preservatives. The hops and malt extracts give the must a somewhat beerlike taste, hovever must is not fermented and contains no alcohol.
Julmust is the source of some annoyance at Coca-Cola in Sweden, since Sweden is the only country where the consumption of Coca-Cola drops during Christmas. Swedes drink julmust instead.