Place pecans on large glass plate and microwave on high for 8 minutes, stirring at 2 minute intervals. Set aside. In an 8 cup measure, microwave butter on high for 1 minute. Stir in brown sugar and milk until blended. Microwave on high for 7 minutes, stirring at 2 minute intervals. Beat with a wooden spoon until stiff, about 5 minutes. Stir in vanilla and roasted pecans. Spread in lightly buttered 8 inch square glass dish. Chill until firm. Cut in squares.
Yield: 1 1/2 pounds.