The Reuben dip itself had a good sauerkraut flavor and nice little chunks of corned beef mixed in. It was both a little creamy and crunchy. The cream cheese mixed with Swiss cheese served the dip well and there was just a hint of Thousand Island tang. Overall, the dip portion of the doughnut, since it had to fit into such a small diameter hole, was rather small, but Starlight was able to do a good job mixing the ingredients so that all of the vital flavors made their appearance. Despite the proportion of brioche doughnut to the dip being obviously heavier toward the doughnut side, the whole package worked well and definitely tasted satisfying.
Whatever proportions Starlight Doughnut Labs used in their dip recipe would really serve well for a number of Reuben-flavored concoctions, but the savory doughnut that they use was a perfect match.
Hopefully they will bring back this specialty flavor in the future. You can access their Instagram page here: Starlight Doughnut Lab.