To purge a food from the table, click on this tool and click on the food, it will be permanently deleted. Click on an empty table space to deselect this tool.
If you want to be able to retrieve the food after deletion, you can use the right-mouse to drag a food to the trashcan (located to the right of the refrigerator), it will open up to accept the food. Right-clicking on the trashcan reveals the food that had been deleted, which can be dragged out to the table. To empty the trashcan, just click "Empty."
To clear the table of all the food with just one action, click on the "Clear" tool from the Remote control (the broom icon); a warning will appear to confirm your request. If confirmed, all food will be cleared from the table; click again to purge any plates, once again to clear a Meal-tray.
