If you want to warm it up, you can gently reheat it on a griddle, but this may dry it out. If you have a bamboo steamer, you can warm the lefse, still swaddled in its tea towel, over slightly steaming water in the steamer.
To enjoy your lefse, you can simply spread with butter, roll up and eat. A sprinkle of cinnamon sugar is yummy, too! And of course, pickled herring, gravlax, rullepolse, or lingoberry jam are all perfect companions for lefse. I had a delicious 'Lefse Brat' at the State Fair this year that I found at the 'Sausage Sisters' booth in the food building....served with lingonberry ketchup....absolutely delicious!
Just goes to show you that there is no limit to creativity with lefse....Enjoy!