01 - In a large bowl, dissolve the sugar in warm water. Sprinkle the yeast over the water and let stand for 5–10 minutes until foamy.
02 - Stir in the salt and oil. Gradually add flour, 1 cup at a time, mixing until a soft dough forms. You may need slightly more or less flour, but the dough should pull away from the sides of the bowl and not be too sticky.
03 - Knead the dough on a lightly floured surface for 6–8 minutes until smooth and elastic.
04 - Transfer the dough to a lightly greased bowl. Cover and let rise in a warm place until doubled, about 1 hour.
05 - Punch down the dough and divide in half. Shape each half into a loaf and place in two greased 9x5-inch loaf pans.
06 - Cover the pans and let rise again until the dough rises about 1 inch above the rim, about 30–45 minutes.
07 - Preheat your oven to 350°F.
08 - Bake loaves for 25–30 minutes or until golden brown and loaves sound hollow when tapped.
09 - Brush the tops with melted butter, if desired, for a softer crust. Remove loaves from pans and cool on a wire rack before slicing.