How to cook papadums

Step 6 Wait until it's cooked on one side...

Here you can see that the papadum is covered in bubbles except for the parts right above the grill grates. There is a distinct color change in the parts that have already bubbled. In practice, you'll want to move it a little bit with your tongs to avoid this sort of shadowing. The first side is done when the top surface is just barely covered with bubbles.