| • | Heat milk in a small saucepan, until it starts bubbling. Remove from heat.
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| • | Add butter and stir till it melts completely.
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| • | Pour into a large bowl to cool.
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| • | Dissolve yeast in the milk mixture.
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| • | Mix in 1/3 cup sugar, salt, eggs and 2 cups flour. Whisk.
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| • | Stir in the remaining flour, 1/2 cup at a time, beating well after each addition.
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| • | When the dough has pulled together, turn it out onto a lightly floured surface and knead until smooth and supple.
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| • | Lightly oil a large bowl, place the dough in the bowl and turn to coat with oil.
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| • | Cover with a damp cloth and let it rise in a warm place, until doubled in volume.
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| • | Divide the dough into 16 equal pieces and make round balls.
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| • | With a rolling pin, roll the balls into oval buns.
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| • | Place them on two lightly greased baking sheets.
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| • | Cover the rolls with a damp cloth and let them rise until doubled in volume, about 40 minutes.
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| • | Meanwhile, preheat oven to 350 degrees F (175 degrees C).
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| • | While the bread rises, make the topping.
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| • | In a small bowl, stir together 1/2 cup sugar, 2/3 cup flour and butter, until a crumb mixture forms.
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| • | Stir in the egg yolks until well blended.
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| • | Crumble the topping over the rolls, in a way that the entire surface is covered.
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| • | Bake in the preheated oven for 15 to 20 minutes, or until sugar topping is lightly browned.
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| • | Mexican Pan Dulce is ready. |