In a Dutch oven, brown roast on all sides in 4 tablespoons butter. Pour 1/2 cup broth and 1/2 cup wine over roast. Cover and bake at 325° for 1-1/4 to 1-1/2 hours or until tender. Remove roast and cool slightly; shred meat with two forks.
In a small skillet, saute mushrooms in 2 tablespoons butter until tender. Add garlic; cook 1 minute longer. Stir in parsley; set aside.
In a large saucepan, bring remaining broth and 1 tablespoon butter to a boil. Combine cornstarch and remaining wine until smooth; gradually stir into the pan. Bring to a boil; cook and stir for 2 minutes or until thickened. Stir in the meat, mushroom mixture, salt and pepper.
Press each biscuit into a 4-in. circle. Place 2 tablespoons meat mixture on half of each circle. Bring edges of biscuit over mixture and pinch seam to seal. Place on greased baking sheets. Bake at 400° for 15-20 minutes or until golden brown. Melt remaining butter; brush over appetizers. Yield: 40 appetizers.