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Weighing each roast before and after confirmed our tasters’ impressions. The roast in the 250-degree oven lost 9.4 percent of its original weight. The roast cooked at 450 degrees shed 24.2 percent of its original weight, almost three times more than the slow-roasted beef. Put another way: The slow-roasted beef lost only 9 ounces of moisture during the roasting process while the high-temperature roasted beef lost 25 ounces. Since we had trimmed both roasts of exterior fat, these numbers represented moisture lost from the meat itself—no wonder the slow-roasted beef tasted so much juicier.
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America's Test Kitchen (The Science of Good Cooking: Master 50 Simple Concepts to Enjoy a Lifetime of Success in the Kitchen)