If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Cook the food as people order as quick as possible. If food is not done and being drag out, it has to be thrown to the rubbish bin and cooked again. $50 will be deducted for wastage. Once food is dragged on the plate/bowl, you can not move them no more. If you want to change to other combination, throw the whole plate/bowl to rubbish bin to cook again.