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1
To prepare the dough, heat oven to 450 degrees.
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2
In a large bowl, combine 5 cups flour, sugar, salt and yeast.
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3
In a small saucepan, combine 7 1/2 tablespoons butter and the milk, and place over low heat until lukewarm.
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4
In a medium bowl, beat eggs lightly, and then whisk in milk mixture.
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5
Stir the liquid ingredients into dry ingredients.
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6
Using a mixer with a dough hook, or by hand, knead dough until smooth and springy, adding more flour if necessary.
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7
Form into a ball, and place in an oiled bowl.
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8
Cover with plastic wrap, and let rise in a warm place until double in size, about 30 minutes.
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9
Punch down dough.
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10
Line a 13-by-10-inch baking pan with parchment paper.
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11
On a lightly floured surface, roll out one-third of the dough, and place in pan.
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12
Roll out remaining dough to a rectangle about 20 by 10 inches.
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13
To make filling, mix together the butter and sugar to make a paste.
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14
Spread paste evenly over large rectangle of dough.
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15
Chop pistachios until splintery, and sprinkle evenly over dough.
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16
Top with chocolate chips.
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17
Starting from longest side, carefully roll up dough so it looks like a long sausage.
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18
Cut dough into 20 slices, each 3/8 inch thick, and arrange with a cut side up on top of dough in pan.
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19
Brush buns with beaten egg, and let them sit in a warm place until puffed up and snugly filling pan, about 15 minutes.
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20
Bake until buns are risen and golden brown, 20 to 25 minutes.
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21
Remove from baking pan to cool on a rack.
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22
Serve warm.
