How long do you cook a 6.2 kg prime rib roast?

I can't give you an exact cooking time for your 6.2 kg prime rib roast. Here's why:

* Oven Temperature: Different temperatures require different cooking times. A higher temperature will cook faster, but may result in a less tender roast.

* Desired Doneness: Do you want it rare, medium-rare, medium, or well-done? Each level of doneness requires different cooking times.

* Roast Shape: Is it a thick, uniform cut, or more irregularly shaped? Shape impacts how evenly it cooks.

Here's what I can offer:

1. Use a Meat Thermometer: The most accurate way to determine doneness is with a meat thermometer. Aim for:

* Rare: 125-130°F (52-54°C)

* Medium-Rare: 130-135°F (54-57°C)

* Medium: 140-145°F (60-63°C)

* Well-Done: 150-155°F (65-68°C)

2. General Cooking Times: These are approximate, adjust based on your oven and desired doneness.

* Rare: 15-20 minutes per pound (7-9 minutes per 500g)

* Medium-Rare: 20-25 minutes per pound (9-11 minutes per 500g)

* Medium: 25-30 minutes per pound (11-14 minutes per 500g)

* Well-Done: 30-35 minutes per pound (14-16 minutes per 500g)

Important Considerations:

* Resting: Allow the roast to rest for at least 15 minutes after cooking. This will allow the juices to redistribute and create a more tender and flavorful roast.

* Seasoning: Season your roast generously with salt and pepper.

* Roasting Method: You can roast your prime rib in a conventional oven or a slow cooker. Both methods have their advantages and disadvantages.

Always check your roast for doneness with a meat thermometer to ensure it is cooked to your liking.