In 1985, The Times published a recipe for the blueberry muffins served at the Ritz-Carlton hotel in Boston, which Marian Burros, who adapted the recipe, judged among her favorite muffins in the city. A few years later, a reader wrote Marian to say that the best blueberry muffins in Boston were in fact from the now-closed Jordan Marsh department store. Marian tracked down and adapted that recipe so you can judge for yourself. But the origins of the Jordan Marsh recipe were unclear until 2023…