30 Hour Sous Vide Eye of Round Roast
Very little has been written about this observation until I came across a scientific site called SciVerse. There is an article entitled “Physico-chemical, textural and structural characteristics of sous-vide cooked pork cheeks as affected by vacuum, cooking temperature, and cooking time.” I just knew it was going to be filled with charts, graphs, facts and scientific references that
most of us won’t understand I find fascinating. Here is a link to the article if you want to numb your mind as well.
What I did learn from this article was that weight loss is lower and moisture content is higher the less the protein is cooked in the water bath. Also, meat cooked above 70-80 degrees centigrade increases the toughness of the meat as the proteins change. (scientifically it is called miofibrilar coagulation). Cooking longer periods of time, even at lower temperatures, resulted in more moisture loss.
I put this new found knowledge to the test on a beef eye of round roast. I knew that cooking this roast in the oven produced a somewhat dry and tough piece of meat. This cut of beef contains little fat and a lot of connective tissue; a perfect test for sous-vide (low fat, high connective tissue). The meat was seasoned with salt and pepper and I added a mustard and garlic rub.
I quickly seared the meat, placed it in a vacuum bag for sealing and cooled it in a ice bath (this is an important step to kill any potential bacteria on the outside of the meat prior to cryovacing). It was vacuum sealed by a FoodSaver and then cooked by sous-vide method at 131 degrees Fahrenheit for 30 hours. I believed this would provide sufficient time to break down the connective tissue and not dry out the protein. After removing the meat from the vacuum sealed bag I seared it off in a skillet to provide color and texture.
The Results: The beef eye of round was full of flavor and as tender as a tenderloin steak. Clearly, the long and slow, low temperature sous-vide cooking method produced a very high quality result. If I had continued to allow the eye of round to cook in the sous-vide water bath for another 24 to 48 hours it would result in loss of weight and a drier final product.
What you can learn from our experiments and research:
- Cooking sous-vide can make a dramatic difference in the quality of the final protein but choose wisely. The biggest difference is in cuts of red meat that are typically low in fat and high in connective tissue. We have also cooked fish with outstanding results which you can read about here.
- While you don’t have to be precise in the cooking time, you should be very precise in the cooking temperature.
- More is not always better. If 24 hours is good, 72 hours is not necessarily better. The longer you cook the protein the more it will dry out the meat, despite the juices being sealed in that vacuum bag.
* I undertook an additional experiment with lamb chops. The recommended cooking time for 1-inch lamb chops is 2 hours at 140 degrees Fahrenheit. Once again, 24 hours seemed to provide the best time to produce a more tender and moist chop.
Note: Please be advised that you should exercise caution when cooking sous-vide. Here are some food preparation tips.
Disclosure – PolyScience has provided us with the Sous Vide Professional Chef Series for our review.
30 Hour Sous-Vide Eye of Round Roast
3 lb. beef eye of round roast
Extra-virgin olive oil
1 1/2 tablespoons black pepper
1 1/2 tablespoons sea salt
3 cloves garlic, chopped
1. Liberally apply yellow mustard, half of the salt and half of the pepper to the eye of round. In a hot skillet, quickly sear the outside of the roast in a little olive oil. Do not try to cook the roast. A quick searing will kill any bacteria that is on the outside.
2. Reapply a generous coating of yellow mustard and the remaining salt and pepper. Add chopped garlic to the outside of the roast and place the roast in a bag that will be used for vacuum sealing.
3. Place the unsealed bag in ice water for about 10 minutes. This is a required step in sous-vide to bring the temperature of the meat back down.
4. Seal the bag using a vacuum seal system. If there are juices in the bag, you might want to freeze the bag for 5 minutes prior to sealing. This process will help prevent the juices from being sucked up and out of the bag which could prevent a good, tight seal. Place the bag in a circulating bath of 131 degrees (medium). Allow to process for 24-30 hours.
5. Remove the roast from the bag. Again, sear the roast in a hot skillet to provide a pleasing finish. Slice and serve.
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