In a small bowl, mix together yeast, warm water, and sugar. Set aside for 10 minutes until the mixture turns frothy and bubbles appear on the surface. (The water should not be very hot.)
In a large bowl, mix together all-purpose flour, yeast mixture, salt, and olive oil till you get a slack dough-like mixture. Use some dry flour and knead the dough for at least 5 to 7 minutes till is smooth. You can also use a cake beater with a dough hook attachment to knead the dough.
Place the dough in a bowl that is smeared with oil and set aside till it doubles in size. This will take about 45 to 50 minutes or sometimes 1 hour.
Take a flat baking dish (9 by 13 inches). Place butter paper on it or grease it with oil. Place the dough in the baking dish and flatten it evenly till it reaches and covers all the edges. Poke some dents all over the flattened dough with your fingers. Again set aside for 30 minutes till it puffs up slightly.