A twelve-hour stint in the refrigerator makes all the difference in this crowd-pleasing layered salad. The mayonnaise dressing that ‘s spread over the top trickles down, and all the flavors come together. A twelve-hour stint in the refrigerator makes all the difference in this crowd-pleasing layered salad. The mayonnaise dressing that ‘s spread over the top trickles down, and all the flavors come together. Advertisement