Yeast is a one-celled organism that provides the leavening (rise) to breads. It is usually sold dry, in small granules, and must be activated with water and heat. Yeast is also used to ferment wine and beer: it consumes sugar, and produces alcohol as a byproduct.

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Why didn't my crumpets cook in the middle?

I tried to make crumpets today, first time I've used yeast so didn't really know what to expect. The recipe I followed was: 450g plain flour 1tsp caster sugar 14g instant yeast 350ml skimmed milk ...