Stir the yeast and sugar into 50 g of lukewarm water. Cover and let stand for about 7 minutes, until the mixture becomes foamy and small bubbles appear on the surface.
Place the flour in a large mixing bowl and make a well in the center. Pour the activated yeast mixture into the well.
Add the salt and 2 cups of lukewarm water. Mix well and begin kneading until the flour is incorporated and the dough comes together. If the dough feels too dry, add a little extra water at a time, using up to another 1/2 cup only as needed.
Add the oil and continue kneading until it is fully worked into the dough and the dough feels smoother and more elastic.
Cover the bowl tightly with plastic wrap. Cover with a clean kitchen towel as well to help keep the dough warm, then leave it in a warm place for about 1 1/2 hours, or until noticeably risen, light, and puffy.
Gently transfer the risen dough to the baking dish or pan you will use for baking. Shape it into an even loaf without pressing out all of the air.
Let the dough rest in the baking dish for another 30 minutes, until it puffs up again.
Preheat the oven to 350°F (180°C). Mix the egg white with a small splash of water and gently brush it over the top of the dough.
Bake for about 1 hour, until the bread is deeply golden brown and baked through.
Let the bread cool before slicing so the soft crumb has time to set.