Mix flour, salt, and yeast in a bowl, then stir in water and oil until a sticky dough forms.Cover and let rise at room temperature for 12 to 18 hours until bubbly.Turn dough onto a floured surface, gently fold, and divide into 8 portions.Shape into balls, place on parchment, and rest for 30 to 45 minutes.Preheat oven to 475°F and heat an empty pan on the lower rack.Bake rolls while adding hot water to the pan to create steam.Bake 20 to 25 minutes until golden and crusty, then cool before serving.