These are a perfect accompaniment to Pork Chops with Roasted Peppers.
Working with a few at a time, lay collard leaves in a stack. Roll them up like a cigar, and cut crosswise into thin shreds.
Heat oil in a large skillet until very hot. Add collards, little by little, stirring in more as each handful wilts. Sprinkle with salt and red-pepper flakes. Saute collards, stirring, until tender, 8 to 10 minutes.