Brisket w/Tzimmes I

Ingredients

• 1 6 to 7 pound first-cut brisket
• 1-3/4 tsp. salt
• 1 tsp. black pepper
• 3 tbsp. olive oil
• 4 cups brown chicken stock
• 3/4 cup sherry vinegar
• 2 pounds carrots, peeled and cut crosswise into 2" long pieces
• 4 medium sweet potatoes, peeled and cut into 2" pieces
• 2-3/4 cups dried prunes, pitted