Preheat oven to 350 degrees F. Grease and flour a 9-by-13-inch baking pan.
Prepare, bake, and cool cake as directed on package.
For frosting, heat and stir pecans and butter in a skillet or large saucepan until pecans are toasted. Remove from heat and stir in remaining ingredients until well-mixed. Immediately evenly pour over cooled cake and spread quickly, distributing pecans. Let cool until frosting is well-hardened. Can serve from 12 to 16.
Recipe by The Culinary Cellar at https://theculinarycellar.com/baking-with-american-dash/