Mix the sugar, water, and yeast in a stand mixer using the paddle attachment. Let it sit for 5 minutes.
Add the flour and salt to the yeast mixture and combine.
Let it stand for 15 minutes.
On a medium speed setting, mix for 6 minutes.
Attach the dough hook and mix for an additional 6-7 minutes. The dough should be wet.
Grease a bowl and and put the dough in it. Cover with a kitchen towel and let it rise for 2 hours.
Line a baking sheet with parchment paper and dust with flour.
Pour out the dough onto a floured surface and divide it into 3 sections. The dough will be wet and sticky.
Place the dough sections onto the baking sheet. Using wet hands, form the dough into loaves.
Dust the loaves with flour. Cover with a kitchen towel and rise for another hour.
Place a baking stone on the center rack of your oven and an empty pan on the bottom. Make sure the sides of the pan are tall enough to hold 1 cup of water. Preheat your oven to 400° F while the stone and pan are inside of it.
When heated, pour the 1 cup of water into the bottom pan. Place the parchment paper with the dough directly on the baking stone.
Bake for 20-25 minutes.