I'm an amateur cook and I can't afford to buy "good" steaks, so I made my own Sous Vide circulator to try and get the best out of cheap meat cuts. Thing is, where I'm from, even the less-glamorous cuts of A-Grade beef is too expensive for me. So I buy C-Grade rump, which is basically meat from older animals.
My question is: How do I adjust my Sous Vide temperatures and times for the older beef? I tried a 1-inch rump steak at 65C for 2 hours and it came out dry cos all the juices from the meat seemed like it oozed out into the bag. I salted it before the sous vide phase.
I previously tried a big piece of rump on a 16 hour cook time, and it was also very dry cos all the juices had come out into the bag.
What are my option to make a decent steak out of C-Grade rump?
EDIT#1: So a few suggestions that my temp controller isn't accurate… I do have a candy thermometer lying around. I'll try double-checking it against that. Also, from the other question that was linked, there's a suggestion to hold back on the seasoning until after the cook is done. I'll give that a try next time. I've looked at Douglas Baldwin's "Practical Guide to Sous Vide Cooking" and I think I might try a sub-60C cook to extract the magic from this passage:
Indeed, collagen begins to dissolve into gelatin above 122°F to 131°F (50°C to 55°C) (Neklyudov, 2003; This, 2006). Moreover, the sarcoplasmic protein enzyme collagenase remains active below 140°F (60°C) and can significantly tenderize the meat if held for more than 6 hours (Tornberg, 2005).
EDIT#2 : See my link below. It's a scholarly article on fibrous connective tissue, which makes comments about older animals and the effect on collagen. It's a bit over my head, but might be interesting to anyone who has the appetite for food science…
Click Here for the article
Best Answer
Older animals will have much more flavorful meat, but the only way to get the meat tender is to cook for a long time with moisture, at a relatively low temperature. This means braising or steaming. It is unlikely that sous vide methods will provide the temperature necessary to break down the collagen proteins, nor does it usually provide enough moisture. It is really not appropriate to use this grade of meat for steak, or any quick cooking method.
A possible alternative would be to use a marinade which includes fresh pineapple juice or papaya juice. These juices contain enzymes which break down the protein structure of meat and make it more tender, but must be used fresh, as the canning/pasteurizing process denatures the enzymes, making them ineffective.