Begin by dissolving the yeast in the water in a small bowl.
Add the flour, salt and olive oil and knead together well for 2-3 minutes. Leave to rest overnight in the fridge
The next day, remove the dough from the fridge and leave it to stand for 30 minutes to reach room temperature.
Preheat up the grillit® by placing it over a medium heat. Whilst the pan heats up, divide the dough into 4 equally sized pieces and form into long, flat breads.
Put the four flat breads on a plate greased with the vegetable oil, turn the flat breads over on the plate to ensure the breads are covered with the oil. Put the flat breads on the grill and cook for 5 to 6 minutes, turn, reduce the heat to low and cook for a further 5 minutes.
Remove the flat breads from the grill and immediately brush them with a little olive oil. Sprinkle the breads with the salt and rosemary and serve warm.