Place the brie into an oven safe dish just slightly larger than the wheel and place into a preheated 350° oven
Place the bacon into a saute pan and cook until crisp. Remove the bacon from the pan and reserve. Melt the butter and saute the onion, apple, till transusat add pistachios for 2 to 3 minutes. Add the maple and cook until slightly reduced. Add the coffee, reduce a bit further and add the bacon back in.
Remove the brie from the oven and place on a serving plate, top of the brie and top with the apple, onion, maple coffee sauce