Dump the butter into a bowl and use the pastry cutter to work out the rest of the buttermilk. (homemademommy.net)
Add in the rest of the flour mixture and beat on low speed until almost combined, then add in the rest of the buttermilk and beat on low until all mixed in. (justsotasty.com)
Repeat with the rest of the buttermilk and hot coffee. (sunnysideupsd.com)