Possible Clues:

• Restaurant list not for everyone
• Where a grilled cheese can be found at McDonald's
• The burger chain In-N-Out has a famous one
• List of unadvertised restaurant items
• Where to "find" the McCrepe
• Food only found by those who know, and a hint to this puzzle’s theme
• Restaurant feature for insiders, or what the starred answers' first 3-5 letters comprise?