Place the yeast, sugar and milk in a bowl and mix to combine. Set aside in a warm place for 5 minutes or until bubbles appear on the surface.
Preheat oven to 180C. Place flour, salt, oil and yeast mixture in a bowl, mix until a smooth dough forms. Knead on a lightly floured surface for 5 minutes or until smooth and elastic, adding a little extra flour to the dough if it is sticky.
Return to the bowl, cover with tea towel and set aside in warm place for 30 minutes or until dough doubled in size.
Press the dough onto the lightly greased baking tray to about 1cm thick.
Sprinkle rosemary, olive, garlic and coarse sea salt on the dough.