DIGESTIVE BISCUITS

Steps:

• Preheat oven to 325 degrees. Pulse flours, baking soda, salt, and brown sugar in a food processor to combine. Pulse in butter until mixture resembles coarse meal. Add 1/4Â cup milk; process until a dough forms. (If too dry, add more milk, 1 teaspoon at a time, until it holds together when squeezed.) Wrap dough in plastic; flatten into a disk. Refrigerate until firm, at least 30 minutes and up to 1 day.
• Preheat oven to 325 degrees. Pulse flours, baking soda, salt, and brown sugar in a food processor to combine. Pulse in butter until mixture resembles coarse meal. Add 1/4 cup milk; process until a dough forms. (If too dry, add more milk, 1 teaspoon at a time, until it holds together when squeezed.) Wrap dough in plastic; flatten into a disk. Refrigerate until firm, at least 30 minutes and up to 1 day.
• Remove dough from refrigerator; let stand at room temperature until malleable but still firm, about 10 minutes. Roll out to a 9-by-10-inch rectangle (about 1/8 inch thick). Using a 2 1/2-inch cookie cutter, stamp out rounds. With the back of a knife, score tops in a crosshatch pattern. Whisk egg white with 1/2 teaspoon water; brush top of each biscuit with egg wash. Place biscuits 1 inch apart on parchment-lined baking sheets; bake until firm and dry in centers and slightly darkened, 24 to 26 minutes. Let cool completely.