01 - Dissolve sugar in warm water in a large bowl. Sprinkle yeast over the surface and let stand 5-10 minutes until foamy and activated.
02 - Stir salt and oil into yeast mixture. Gradually add flour, 1 cup at a time, mixing until soft dough forms that pulls away from bowl sides. Adjust flour as needed.
03 - Turn dough onto lightly floured surface and knead 6-8 minutes until smooth and elastic, adding only enough flour to prevent sticking.
04 - Place dough in lightly greased bowl, turning to coat all sides. Cover and let rise in warm place until doubled, approximately 1 hour.
05 - Punch down dough and divide in half. Shape each portion into a loaf and place in two greased 9x5-inch loaf pans.
06 - Cover pans and let rise until dough extends about 1 inch above pan rim, approximately 30-45 minutes.
07 - Preheat oven to 350°F while dough completes second rise.
08 - Bake loaves 25-30 minutes until golden brown and loaves sound hollow when tapped on bottom.
09 - Brush tops with melted butter for softer crust, if desired. Remove from pans immediately and cool completely on wire rack before slicing.