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Irish Rib Roast on the Bone

Irish Rib Roast on the Bone

Irish Rib Roast on the Bone

This blog post shows you how to cook an Irish Rib Roast on the bone. This cut is also sometimes also known as a Prime Rib or a standing rib roast.

This is a very tender cut of beef from between the 6th and 12th rib of the animal. It has a certain amount of marbling which improves the flavour, especially when roasted in the oven. And it really is VERY tasty!

The term “prime” refers to the grade of the beef, with prime being the highest grade and indicating that the meat is from younger cattle and has abundant marbling. However, not all prime rib is necessarily graded as prime.

Rib roast or prime rib is a perfect cut to serve as an alternative to Turkey at Christmas or Thanksgiving if you are looking for something different.

We actually ate Irish Rib roast last year for our Christmas dinner. It is now one of my favourite beef recipes.

medium cooked prime rib

And of course, if you are looking to do it properly, you should serve it up with some good old Yorkshire Puddings and gravy! But more on the trimmings later on.

How to cook a rib of beef

The cooking times depend of course on how you want your rib roast to end up; rare, medium or well done.

We bought our Irish Rib roast from Aldi, bought along the Wild Atlantic Way in the West of Ireland.

It was actually a Bord Bia-approved Irish Black Angus Beef rib roast on the bone and came looking like this:

aldi irish rib roast

This was one we tried out a bit before Xmas, and decided it was SO good we would have it again on Xmas day instead of the standard roast Turkey!

irish rib roast
Seasoned rib

It was big enough to feed the three of us for two days and we had some delicious roast beef sandwiches on day two.

browning the rib roast
Browning the roast in a skillet

Prime rib cooking times

The cooking times for prime rib as recommended by Aldi were as follows:

  • Rare: 20 minutes per 500g plus an extra 20 minutes
  • Medium: 25 minutes per 500g plus an extra 25 minutes
  • Well Done: 30 minutes per 500g plus an extra 30 minutes

But I found in practice that the times stated above were perhaps a little bit more than necessary in my oven. This was, for example, the one I made before Xmas using the medium times above:

medium cooked rib roast
Medium Cooked Rib Roast

For me, this could have been a little bit redder inside. So on Christmas day I used the ‘rare’ times above and this was the result (excuse the poor carving marks – it was Christmas day and we start early!!):

rare rib roast

As you can see, a lot pinker inside, but I would still call this more medium-rare, than rare. Still, both were delicious and extremely tender.

rib roast slices

Of course, the difference could also be down to the variation in my own oven temperature. My oven is not entirely even and accurate and something you may also need to take into account.

Another way of checking is by measuring the temperature of the meat with a meat thermometer to achieve what you want. This temperature guide for roasting meat can give you an indication of what temperatures you need to look for when you remove the meat from the oven.

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rib roast resting
The rib roast resting after the oven

You need to be aware that the temperature of the meat will rise while it is resting, so do not leave it too long before you remove it from the oven to avoid overcooking it.

Maybe using a combination of both is the way to get the result you want in your own oven.

What to serve with rib roast

You can of course serve a rib roast or standing rib roast with all sorts of vegetable trimmings.

But there are a number of veggies that I always serve with a roast dinner, whether it is chicken, turkey, beef or lamb.

These vegetables are my crispy roast potatoes, honey roasted parsnips and my baked garlic carrots recipes. The reason is that these will all cook in the oven with the meat and all with minimum fuss. And of course, a tasty beef gravy or Irish Whiskey gravy is a must.

And in the UK roast beef should never be without its Yorkshire Pudding, and we find that some delicious Brussels Sprouts sauteed with chestnuts is also a superlative side dish.

So this is what my Christmas dinner plate looked like last year, before I added some Horseradish to the side of my plate:

christmas dinner plate

But some cauliflower cheese, pan-fried asparagus or tender stem broccoli also all go very well with this delicious dish.

I hope you enjoy trying this easy recipe and appreciate it as much as we did. If you do please let us know how you get on in the comments section below!


How to cook Irish rib roast on the bone

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rib roast

Irish Rib Roast on the Bone

Yield: 8
Prep Time: 10 minutes
Cook Time: 1 hour 20 minutes
Additional Time: 10 minutes
Total Time: 1 hour 40 minutes

This simple recipe will help you to cook an Irish rib roast, or Prime rib, on the bone. A perfect Sunday lunch with all the trimmings. Also a great alternative to the standard Xmas or Thanksgiving Turkey.


  • 1 x 1 1/2 Kg Beef Rib Roast on the bone
  • 3 garlic cloves, chopped
  • 3 thyme sprigs
  • 2 tbsp olive oil
  • Salt and black pepper
  • Water


  1. Pre-heat your oven to 180C.
  2. Peel and chop your garlic and thyme leaves, and rub them into the outside of the rib roast.
  3. Then heat the olive oil in a skillet. Brown the beef in the skillet on all sides, then remove and place in a roasting tin. Season well with freshly ground black pepper and salt.
  4. Add 125ml of water to the roasting tin and cover the roast rib with tin foil, to prevent the moisture from escaping from the meat.
  5. Place in the oven for the time as determined by weight and intended doneness as follows:
  • Rare: 20 minutes per 500g plus extra 20 minutes
  • Medium: 25 minutes per 500g plus extra 25 minutes
  • Well Done: 30 minutes per 500g plus extra 30 minutes

6. Remove the tin foil for the last 20 minutes of cooking time and baste to brown the outside further.

7. Then remove from the oven and allow to rest for 10-15 minutes before carving.

8. Use the juices from the tin to make some delicious beef gravy.


Slice the meat either in thin slices without the bone or as a thick steak with bone, before serving up with all the normal trimmings and some tasty beef gravy.

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Nutrition Information:
Yield: 8 Serving Size: 1
Amount Per Serving: Calories: 671Total Fat: 54gSaturated Fat: 21gTrans Fat: 0gUnsaturated Fat: 27gCholesterol: 156mgSodium: 157mgCarbohydrates: 0gFiber: 0gSugar: 0gProtein: 42g

This nutrition information was automatically calculated by Nutritionix, but may not be 100% accurate.

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Some side dishes to accompany your Prime Rib:

Baked Carrots with Garlic
Best Crispy Oven Roasted Potatoes
Honey Roasted Parsnips
Brussels Sprouts and Chestnuts Recipe
Cauliflower Grilled Cheese
Oven Roasted Long Stem Broccoli
Pan Fried Asparagus
Goose Fat Yorkshire Puddings

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