Combine flour, yeast, salt and sugar in a bowl. Make a well. Add water and oil. Use your hands to bring dough together.
Turn dough onto a lightly floured surface. Knead for 10 minutes or until smooth and elastic. Brush a bowl with oil. Add dough. Turn over to coat with oil.
Cover with a damp tea towel. Set aside in a warm place for 30 minutes or until dough doubles in size. Gently punch down dough with your fist.
When ready to cook pizza, preheat oven to 200°C. Knead pizza dough for 30 seconds or until dough is original size. It is now ready to place in a pizza tray lightly dusted with polenta.
Top with tomato paste, vegetables and cheese. Bake for 10-15 minutes, until golden.