When cooked properly, tough cuts of meat like beef shank and pork shoulder transform into fork-tender meat swimming in a rich braising sauce. How does this magic happen — and how long does it take to get there? America's Test Kitchen ran some tests that make it clear why tough meat tastes best when its braising liquid is full of gelatin.When you cook a tough cut of meat, the hard-to-chew collagen in the flesh breaks down into gelatin, which is what gives the finished braising sauce its silky richness. The more gelatin in the sauce, the more tender the meat. To demonstrate how gelatinous the braising sauce is at each stage in the cooking process, the cooks at America's Test Kitchen chilled a sample of the sauce after one, two and three hours of cooking.
Not surprisingly, the sauce after one hour was loose and mushy, while the three-hour sauce stood up as firmly as a slice of Jell-O on the plate. It's a visual reminder of why tough cuts of meat need so long to cook, and why you shouldn't waste a single drop of their delicious braising liquid.
→ Read more: We Prove It: Cook Tough Cuts Beyond Well-Done at America's Test Kitchen
Related: What Can I Do With Leftover Braising Liquid?
(Image: Faith Durand; America's Test Kitchen)