Drizzle 2-3 tablespoons of olive oil onto a non-stick baking pan measuring 23 x 33 x 5 cm/9 x 13 x 2 inches. If you are worried about the focaccia sticking to the pan, you can also line the pan with baking paper first.
Carefully transfer the dough onto the pan.
Fold the bottom third of the dough towards the centre.
Then fold the top third of the dough towards the centre. You should now have a fat log of dough.
Turn the dough over so that the seam is facing down, and the length of dough follows the length of the pan.
Use your fingertips to gently push the dough out to almost fill the pan.
Cover the dough with a clean tea towel and place the pan somewhere warm for about 1 to 1.5 hours, or until the dough has almost risen to the top of the pan, and it has spread to fill the pan (or most of the pan) with large air bubbles.