Best Ever Sausage Gravy

Bahan-bahan (8 porsi)

• 1 pound mild breakfast sausage
• ⅓ cup all-purpose flour*
• 3½ cups milk
• ¾ teaspoon freshly ground black pepper
• ½ -1½ teaspoons kosher salt
• 2 tablespoons fresh rosemary (about 2 teaspoons chopped)
• ⅓ cup brown rice flour