In a large bowl, combine the flour, salt, sugar, and yeast. Gradually add the warm water while stirring until a shaggy dough forms. If needed, add 1 tablespoon more water at a time until it reaches the right consistency.
Cover the bowl with a clean kitchen towel. Let the dough rise at room temperature for about 2 hours, or until it doubles in size.
Transfer the dough to a lightly floured surface. Gently shape it into a round loaf without over-kneading. Place the loaf on a parchment-lined baking sheet. Let it rise uncovered for 40 minutes.
Preheat your oven to 450°F. Place a metal pan on the lowest rack to heat.
Dust the top of the loaf with flour and make several 1/2-inch deep slashes across the top. Place the baking sheet in the oven and immediately pour 1 cup of hot water into the empty heated pan to create steam.
Bake for about 30-35 minutes or until the crust is golden brown.
Remove the bread from the oven and let it cool on a wire rack before slicing.