When you heat tortillas they become more pliable, which makes them easier to fold or roll.
As soon as you take tortillas out of the package, stack them under a damp cloth or paper towel until you are ready to use them.
To heat, place a tortilla directly on a gas stove grate, and remove as soon as the tortilla gets light brown spots or puffs in spots. If you don't have a gas stove, you can do this on a grill or grill pan.
You can also heat tortillas in the microwave: Wrap up to four at a time in a damp paper towel and microwave for about 30 seconds, until just warmed. Don't warm them ahead of time‚ as soon as they cool off, they become less pliable again.
Recipe: Chipotle Shrimp Tacos