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1
Place water in processor.
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2
Sprinkle yeast over.
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3
Let stand until yeast dissolves, about 8 minutes.
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4
Add 1 cup flour; process until blended.
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5
Scrape down sides of work bowl.
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6
Add 1 cup flour; repeat processing and scraping.
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7
Add remaining 1 1/3 cups flour.
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8
Process until small moist clumps form.
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9
Gather dough into ball (dough will be firm); place in large bowl.
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10
Cover; chill overnight (biga will soften, resembling thick oatmeal in texture).
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11
Pull biga into walnut-size pieces; place in a clean large bowl.
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12
Add water, yeast and 1/2 cup plus 3 tablespoons semolina.
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13
Using 1 hand, squeeze ingredients together 2 minutes.
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14
Work dough 4 minutes by scooping sections from sides of bowl and pressing into center, blending into very soft, shaggy mass.
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15
Using spatula, scrape dough from sides of bowl into center.
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16
Let dough rest in bowl, uncovered, 10 minutes.
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17
Sprinkle salt over dough.
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18
Using 1 hand, knead dough by rotating bowl 1/4 turn at a time, scooping dough from sides and folding down into center until dough starts to come away from sides of bowl, about 5 minutes.
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19
Scrape dough from hand and sides of bowl.
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20
Cover bowl with towel; let dough rest 20 minutes.
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21
Rotating bowl 1/4 turn at a time, fold dough over onto itself 6 times; turn dough over in bowl.
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22
Cover with towel and let dough rest in bowl 20 minutes.
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23
Preheat oven to 425F.
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24
Sprinkle work surface with additional semolina.
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25
Turn dough out onto semolina.
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26
Using pastry scraper or large knife, cut dough in half; keep halves separated.
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27
Let stand, uncovered, 20 minutes.
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28
Sprinkle 2 large baking sheets with additional semolina.
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29
Transfer each dough half, semolina side up, to 1 sheet.
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30
Stretch each dough half to 16x4-inch rectangle.
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31
Press fingertips into dough in several places to dimple surface (characteristic of this bread).
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32
Bake until golden brown, about 25 minutes.
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33
Cool.
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34
(Can be prepared 2 weeks ahead.
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35
Double-wrap in aluminum foil to freeze.)