Combine yeast, sugar and 1/2 cup very warm water in bowl let sit for five minutes. Combine flour and salt in bowl. Mix yeast mixture with bowl containing dry ingredients. Add a little extra flour if dough is sticky. Knead for a good 10 minutes. Put into a greased bowl and let rise for 60 minutes until it doubles in size. Turn out onto a floured surface then knead lightly until smooth. Roll out into a 1/4 thick 12 diameter circle. Fit into greased pizza pan. For pizza parlor-style crust be sure to use a thin metal pan with holes in the bottom. The holes allow heat to pass through the pan and brown crust. Top as desired and place on bottom rack. Put sheet of aluminum foil on top rack above pizza to keep ingredients from browning too quickly. Bake at 375F for 30 minutes.