I used a grill pan (a non-stick skillet works, too) and a cast iron skillet to press my sandwiches. Any heavy pan or pot, or a brick wrapped in foil can be used as a press. Here’s another trick — heat up your “press” on a separate burner before placing it on top of your sandwiches to help them cook from the top down as well. You’ll optimize melting without burning your bread. Just be sure to use oven mitts when handling the hot “press”.