楼层:#9
由 john8848 » 30 10月 2014 20:18
古狗了一片有关肉老的问题:
We like our meat tender and juicy at the same time...
We therefore want our meat to be cooked tender where tough collagen is converted to gelatin but with a minimum loss of moisture. The reality is that these methods are contracdictory and hence the challenge or dilemma to cooking meats. To minimize moisture loss requires temperatures less than 130F, however .turning collagen into gelatin requires temperatures above 160F and for extended time periods. As moisture evaporates, the meat begins to shrink. A slab can lose 20% or more of its weight in cooking due to shrinkage. Even meat cooked in liquid will dry out although not as quickly. So we are faced with a dilemma. To liquefy the collagen we need to cook the meat to 180F and hold it there for for long periods of time. But by then it is well past well-done and the muscle fibers can be dryed out. As a result, we need to add moisture.
How to slow loss of moisture
Brining. Brining adds a significant amount of moisture, it helps retain moisture during cooking, contributes noticeable flavor enhancements.
Steaming. Another method of adding moisture is to cook the meat in very high humidity by wrapping it in foil with a little water or juice. This keeps moisture from escaping and some vapors penetrate the meat.
Braising or poaching (--low temperatures--). Braising is a method of cooking by submerging the meat in hot liquid, but not hot enough to boil. Braising can give you juicy, tender, and flavorful meat, especially if you use a flavorful braising liquid. But it tends to pull all the collagen out and rob the meat of its natural flavor. Flavor the liquid (water with pickling spices is a nice simple start), completely submerge the slab, keep the lid off, keep the temp down to about 160-180F for about 30 minutes, and let the meat cool in the liquid for 20-30 minutes so it will absorb some of the water before putting it on the grill.
Breakage of collagen covalent links using Acids -- (Tenderizing meats with acid) -- It is well known that adding a little vinegar to a stock will help tenderize meat while cooking. It is also useful to marinate meat for a few hours using vinegar to tenderize meat. Offer and Knight (1988) suggested that one of the mechanisms of pH induced tenderisation of meat could be a breakage of covalent collagen cross-links and of some specific peptide bonds.
Here are tips to keep in mind when slow-low roasting:
- Develop a caramelized crust before slow cooking -- by searing the meat either in a dry pan or with a small amount of oil or fat.
- Place the meat or roast fat side up in the pan so it self-bastes.
- Tenderize your cuts of meat --e..g, pounding meat, buying aged meats (Note: meats cooked longer a 120F will age and be more tender), marinading meats with acids with tenderize the meat.
- Tent the resting meat with foil and allow 10 to 15 minutes before cutting it so the meat's juices will return to the center; slice the meat against the grain.
不知道破吃鱼片在蛋清里洗完澡,放入开水或70度水里,而不是热油里,经过保湿润处理后,再抄鱼片会如何,会不会嫩些?要不试试。