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Food researchers have pinpointed the key to a flawless cacio e pepe: controlling temperature and water ratio to create a stable emulsion of pecorino cheese and starchy pasta water. This Roman classic can turn gummy if overheated or if the cheese is added too hastily. By gradually blending freshly grated pecorino with warm—but not boiling—pasta water, home cooks can achieve a velvety sauce laced with pepper’s spicy bite. The science behind it is straightforward: cheese proteins need gentle handling to avoid clumping. Pepper also disperses more evenly when introduced at the right stage. For pasta lovers, these insights unlock a beloved dish that’s surprisingly easy once the technique is mastered.