As you'll be able to see from the label I've so thoughtfully provided as an illustration, it wasn't just sugar that was used to sweeten these beers. They used artificial sweeteners, too. For some reason that was allowed, even in the Reinheitsgebot days. It's amazing how many ingredients - other than the malt, hops, water, yeast - were allowed under the RHG."Süßbier and Malzbier, also Doppelbier and Kraftbier, are without exception dark in colour and have a sweet taste. The latter rests partly on the malt used in their manufacture; the minimum quantity of malt is, for such beers as Malzbier or those beers which have "Malz" in their name and are made with sugar, in the North German Brausteuergebiet legally set at a minimum of 15 kg per hectolitre. The sweet taste in these beers is also partly derived from sugar, which however is not used in all such products. The original gravity of these beers derived from malt differs greatly, however names such as "Doppel-", "Kraft-" and suchlike imply an especially concentrated wort, in whose manufacture at least the amount of malt normally used for bottom-fermenting Lager is employed. The malt is usually high-dried, and contains an addition of up to 10% Karamlemalz. It is coloured with Farbmalz, Farbebier or Biercouleur. Mashing schemes vary greatly and hopping is very light. For fermentation only lightly-attenuating yeast is used; lagering is performed in several ways according to one of the methods described. The addition of sugar, often in the form of a concentrated water solution, which these beers undergo, amounts to between 2 and 5 kg per hectolitre of beer and usually occurs during filling."
"Encyklopädisches Handbuch der technischen Chemie, Volume 4, Part 1", 1915, page 304. My translation.
Broyhan is next. That's the beer I'd most like to see revived. If only I could work out how the hell it was brewed. Maybe we'll find out tomorrow.

