So that's hamburgers out, Alex. Good riddance. And since Scotch whisky uses old port barrels (I think), it'd buggger up that as well. Not so good riddance.

But in general, that's a rotten principle. Waste not, want not.

Is the difference between Vegemite and Marmite (etc) because the Vegemite is made from top growing lager yeast, and the Marmite (etc) from bottom growing yeast? Does it make any difference whether it's a by product of brewing bitter or stout? I get a vision of some hyper Marmite made as a by produxct of Guiness...