Sauce: In a small saucepan add shallot, parsley stems, peppercorns, cider vinegar and espresso that has been disolved in boiled water, Bring to a simmer over medium heat until reduced to 2tsp (about 10 minutes)
Whisk in heavy cream stirring constantly, then begin adding butter about 3 cubes at a time, adding the next three after the previous ones have melted into sauce. Once all the butter has been incorporated remove from heat, add sugar and season to taste with salt and pepper strain and set aside until plating.
To serve put a small amount of sauce onto the plate and add the scallop to the top. Garnish with the parsley leaves, serve warm.