0_Apprentice
My friend has been sending me pictures of all the baked goods she has made recently. She must be so talented to be a baker!
1_Wizard
Does she bake breads?  I love breads baked with beer froth (discovered by the Gauls) because is controlled yeast in the dough.
0_Apprentice
Yes, but I don't think she has ever used beer froth before! Can you tell me more?
1_Wizard
Bread has to proof, or rise, before baking.  The process is known as fermentation.  Beer froth helped this process.
0_Apprentice
That is really interesting. I've had fermented cabbage and it's delicious. What other types of things can you bake?
1_Wizard
Well, you can bake sourdough bread, but it tastes almost as bad as that Kimchi you mentioned!
0_Apprentice
I guess opinions will vary, I love sourdough bread! Do you know how they make rye bread?
1_Wizard
Ha ha somehow I knew we disagreed about the taste!  Rye-based breads use biological leavening just like sourdough.