What is that glossy skin on brownies?

Adam Ragusea

Adam Ragusea

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Dr. Pia Sörensen at Harvard: https://sorensen.seas.harvard.edu/

Dr. Sörensen's new book, "Science and Cooking: Physics Meets Food, From Homemade to Haute Cuisine": https://wwnorton.com/books/9780393634921

My old video on box cake mixes: Boxed cake vs scratch cake — Why bakers ca...