Chocolate-Covered Digestive Biscuits (McVities)

Make the Dough: Adjust oven rack to lower-middle position and preheat to 350°F (177°C). Combine all-purpose flour, whole wheat flour, sugar, baking powder, baking soda, salt, and cubed butter in the bowl of a food processor. Process until butter virtually disappears into a fine, floury meal. Add buttermilk and pulse to form a damp and crumbly dough. Turn onto an unfloured surface and knead into a ball.

Roll and Bake the Biscuits: On a generously floured surface, roll dough until just shy of 1/4 inch (4.7mm), using as much flour as needed along the way to prevent sticking. Dust away excess flour with a pastry brush and decorate with a docking tool if you like. Cut into 2 3/4–inch rounds and transfer to a parchment-lined half sheet pan. Gather up scraps, knead, roll, and cut as before.

Bake until firm to the touch and light brown all over, about 18 minutes. Cool directly on sheet pan and continue with next step, or store in an airtight container up to 3 days at room temperature.

Temper the Chocolate: Temper chocolate according to one of the methods described here .

Coat the Biscuits: Working with just 2 or 3 biscuits at a time, dollop a generous 1/2 tablespoon, or just over 1/4 ounce, chocolate over each. Spread into an even layer over biscuit and, as chocolate starts to thicken, bounce the tines of a fork across the surface to create a wavy pattern. Repeat with remaining biscuits and chocolate. (Before it hardens, store excess chocolate according to the directions here .) Serve biscuits immediately, preferably with hot tea, and transfer to an airtight container for up to 3 weeks at room temperature.