Open sugar cookie log and press into a rectangle on cutting board. Add pistachios and cherries, press into dough and then re-shape into a log. Slice into 1/4-inch thick rounds. Transfer cookies to a baking sheet.
Bake 7 to 11 minutes, until golden around the edges. Transfer to wire racks to cool completely.
While cookies are baking, melt white chocolate chips in a double boiler or bowl over simmering water.
When cookies are cool, dip bottom half of cookies into melted white chocolate and place on waxed or parchment paper to cool.