Using a slow-cooker also helps maintain moisture, so the beef remains juicy and flavorful without much effort. A pot roast is ideal for a slow-cooker because tougher cuts of meat, like chuck roast ...
Heat a large wide pot or Dutch oven with a lid (a 4–5 litre capacity is ideal) on medium high. Drizzle with 2 tablespoons of olive oil and add the onion. Stir until soft, 2–3 minutes.