Cream the butter and sugar together on high for several minutes, either using an electric whisk or in the bowl of a stand mixer. Add the orange extract and beat again.
Add in the flour and cocoa powder. Beat until a dough forms. Wrap the ball of dough in cling film and let chill in the fridge for 30 mins to firm up.
Preheat the oven to 370℉/180℃. Line 2 large baking trays.
Remove the dough from the fridge, roll to about 1/2 cm thick and use a 7cm cookie cutter to cut out rounds of dough. Place onto tray, these won't spread so they can be fairly close together.
Bake 10-12 minutes until just turning dark at the edges. They'll crisp up more whilst cooling. Repeat for all dough and let cool on a wire rack.
Once cool, spread about 1/2 - 1 tsp marmalade onto the back of half the biscuits. Sandwich with a biscuit without filling.
Melt the chocolate in 20 second intervals in the microwave, checking/stirring to prevent burning. Once melted, spoon about half a tsp onto each biscuit top, spread over the top in an even layer. Place half a glace cherry into the centre of each.
Once the chocolate has cooled and set - eat immediately!