1 1/4 c. packed brown sugar
3 tbsp. butter
2/3 c. pecans, coarsely chopped
1/2 c. sour cream
2 1/4 tsp. cornstarch

Mix brown sugar and butter, sour cream and cornstarch. Cook on medium heat, stirring constantly until mixture bubbles and gets thick, approximately 5 minutes. Remove from heat. Stir in pecans. Pour on cake.