6 tablespoons cold unsalted butter, cut into small pieces
Preparation
In a medium bowl, mix flour, sugars, and salt until combined. With your fingertips, work in butter until large clumps form. Refrigerate, covered, until ready to use (up to 3 days).
This is the type of soup that, at first glance, might seem a little…unexciting. But you’re underestimating the power of mushrooms, which do the heavy lifting.