Life Thanks to Kel Mitchell, the secret ‘Good Burger’ sauce exists, and it’s super-tasty July 12, 2019July 12, 2019 Carly Mallenbaum, USA TODAY Comments Off on Thanks to Kel Mitchell, the secret ‘Good Burger’ sauce exists, and it’s super-tasty Kel Mitchell has made his "Good Burger" sauce available at a Hollywood pop-up. What's in it? Ketchup, lemon, pickles, magic and nostalgia.