First click the food once to clone it. Then click and pull the food to the pizza dough. you can place it anywhere. If you want to delete all the food from the pizza, just click the dough. If you want to delete only one peace, click that peace of food. Click the question mark to see, what the food is called.
If you`re wandering, why SPINACH is written with yellow, its because of the contrast. I could not write it with black, because it would be hard to see. I did not find any bugs yet! ;)