1 qt. seedless grapes, chilled
1 pt. sour cream
1/4 c. sugar
2 tsp. vanilla
1 c. brown sugar
1/3 c. butter

Combine sour cream, sugar and vanilla; set aside. Half the grapes and place in 8 x 8 inch dish. Spread sour cream mixture over grapes. In a saucepan, melt butter, brown sugar, and stir until syrupy. Drizzle over grapes. Chill and serve.