Slow Cooker Guinness Pot Roast - the BEST pot roast EVER! Pot roast, gravy mix, Italian dressing mix, tomato paste, carrots and potatoes. Put everything in the slow cooker and let it cook all day. Serve over mashed potatoes, grits or rice. PERFECT for St. Patrick's Day!! #slowcooker#stpatricksday#potroast#crockpot#comfortfood#guinness