Meh-onnaise

Meh-onnaise is a substance that appears in the Sonic Boom. It is the secret ingredient of Meh Burger's eponymous Meh Burger which is what makes the product so delicious. Supposedly, it is made by leaving some Miracle Whip out in the sun for a few hours.

Trivia

 * Meh-onnaise's name is a pun of Meh Burger's name and mayonnaise.