I’m a fan of thousand island and it’s various permutations around the country. A few years back we were traveling in the southwest and were asked if we wanted “fry sauce” with our fast food order which turned out to basically be thousand island. Similarly, Troy’s Drive-in #6 in Glendale gives a small ramekin of a garlic powder heavy version with their fries. I think the two are connected by the SoCal/SLC pastrami burger migration (NY Times paywall, sorry).