In a small bowl, combine the lukewarm water, yeast, and sugar. Let it stand for 10 minutes, until foamy.
In a large bowl, whisk together the flour and salt.
Add the yeast mixture and melted butter to the flour mixture. Knead until you have a smooth, elastic dough.
Cover the dough with a kitchen towel and let it rise in a warm place for about 1 hour, or until doubled in size.
Divide the risen dough into 8 equal portions, and shape each portion into a long, oval loaf.
Place the shaped dough on a baking sheet lined with parchment paper, and let it rise for another 20-30 minutes.
Preheat the oven to 400°F (200°C) and bake the bolillos for 15-20 minutes, or until golden brown.
Brush the tops of the bread with a beaten egg and serve fresh.
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