1. Preheat oven to 350°. Bake pecans in a single layer in a shallow pan 6 to 8 minutes or until toasted and fragrant, stirring halfway through. Cool 10 minutes. Pulse in a food processor until finely ground.
2. Stir together butter and next 2 ingredients until sugar dissolves. Stir in ground pecans. Serve immediately, or chill until ready to serve. Let stand at room temperature 20 minutes before serving.