Add the garlic to the olive oil and leave to infuse overnight.
Put the flour, salt, yeast and half the olive oil into the stand mixer and mix using paddles for 4 minutes. Change to the dough hook and knead for 2 minutes. Shape into a ball. Lightly oil a large bowl. Place the dough in the bowl, cover and rest for 1 hour.
Line a 13 x 9 baking tray with parchment paper. Tip the dough onto a lightly floured surface and roll out to a rectangle 1" thick and to fit the tray. Sprinkle with the salt water and the remaining oil. Prick the top of the dough with a sharp knife Place the tomato slices on top. Place in the tray and leave to rise for 1 hour.
Preheat the oven to 425ºF. Bake for 25-30 minutes until golden brown.