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1
Stir 1 2/3 cups of the flour, the yeast, and 1 1/4 cups tepid water in a bowl.
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2
Cover with plastic wrap and let stand 1 hour in warm place, until bubbling.
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3
Stir in 1/3 cup oil, the rosemary, and salt and enough of the flour to make a sticky dough.
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4
Cover and let stand for 10 minutes.
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5
Knead on a floured work surface about 8 minutes, until smooth and elastic.
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6
Shape into a ball.
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7
Place in an oiled bowl and turn to coat.
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8
Cover with plastic wrap and leave in a warm place for 1 hour, to double.
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9
Meanwhile, heat the oil in a frying pan over medium heat.
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10
Add the onions, salt, and pepper and cook, stirring, until tender, about 10 minutes.
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11
Stir in the brown sugar, vinegar, and rosemary, and cook 3 minutes more.
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12
Let cool.
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13
Lightly flour a large baking sheet.
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14
Knead the dough on the work surface.
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15
Press into a 15 x 13in (5 x 5cm) rectangle and spread with the onions, leaving a 1in (5cm) border.
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16
Fold the shorter sides in by 1in (5cm), then fold the bottom third up, and the top third down.
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17
Pinch the seams closed, then transfer to the baking sheet, seams down.
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18
Shape into an oblong shape with pointed ends.
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19
Cover with a clean kitchen towel and let stand in a warm place for 30 minutes, or until puffy.
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20
Preheat the oven to 425F (220C).
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21
Brush the dough with the egg and sprinkle with flour.
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22
Cut 3 slashes in the top of the loaf.
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23
Toss the rosemary leaves with 1/2 tsp oil, and sprinkle over.
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24
Bake for 20 minutes.
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25
Reduce the temperature to 400F (200C) and bake for 20 minutes more, until deep golden.