Mississippi Pot Roast

Bahan-bahan (8 porsi)

• 4 to 5 pound beef chuck roast (or pot roast)
• 1 ounce ranch seasoning mix (1 packet, about 2 tablespoons)
• 1 ounce au jus gravy mix (or brown gravy mix, low sodium, 1 packet)
• 6 pepperoncini peppers (plus ½ cup juice)
• ¼ cup butter