To make Bread, one first must get Yeast. To get your first yeast, seal Dried Fruit in a Barrel of Water. After three days, Yeast Starter will form.
From now on, your yeast can be fed by sealing Yeast Starter in a Barrel with Flour. This causes it to multiply. 1 flour per 100mB of Yeast produces 600mB of Yeast. That's a good deal!
Recipe: firmalife:crafting/barley_dough
Yeast Starter, Sweetener, and Flour can be combined to make Dough. Dough can be cooked like normal to produce Bread!.
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Once baked, you can use a knife to cut bread into slices. These can then either be used for sandwich making, or cooked into toast which can be spread with butter or preserves.