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The greatest forward step in the baking industry since bread was wrapped! The Sliced Bread! But was it that great? Apparently it was. It replaced 80% of non-sliced bread in the first five years. The reason was convenience. Read about history of sliced bread.
Tortillas are a simple food but maybe because of that they appeared in many places of the world at the around same time and are still popular as they were when they were necessity. Read about history of tortilla.
Yeast, in its many forms, is today an essential ingredient in bread making. It makes bread lighter and tastier. It wasn’t always so. But thanks to some forgetful baker we can today enjoy in tasty baked goods. Read about history of baker’s yeast.
Flour is on of the basic food materials. It can be used for bread and for other types of food. General method of flour-making stayed the same for thousands of years - grinding. It is just that the technology progressed.