unsalted butter • all-purpose flour • hot milk • kosher salt • freshly ground black pepper • nutmeg • Gruyere, grated (5 cups) • freshly grated Parmesan • Dijon mustard • baked Virginia ham, sliced but not paper thin • of fresh french bread
warm water, 95 to 110 degrees F • or 1 pkg. (1/4 oz.) active dry yeast • buttermilk, room temperature • honey • salt • soft butter • bread flour, about