Add the potatoes to a medium pot and cover with water and season with salt. Bring to a boil and cook for 15 minutes or until just under fork tender. Add the sugar snap peas and boil for 2-3 more minutes. Drain and keep warm.
Make the Beurre Blanc Sauce:
In a small saucepan, add the shallots, white wine, white wine vinegar, and black peppercorns. Bring to a boil and reduce heat to medium and cook for 5 minutes or until the liquid has reduced to about 2 tablespoons.
Add the heavy cream and whisk to combine. Add the butter, one or two cubes at a time, whisking with a flat sauce whisk after each addition until all the butter has been added and the sauce is thick and velvety. Season with salt, pepper, and a touch of cayenne to taste.
Strain the sauce into a bowl through a fine mesh sieve and keep warm. Note: you may need to whisk the sauce to reincorporate the ingredients before serving.
Make the Fish and Scallops:
Heat 1 tablespoon of butter and 1 tablespoon of oil in a medium skillet over medium-high heat until the butter is frothy and melted. Add the fish, skin-side down, and cook for 5-7 minutes or until the skin is very crispy. Gently flip and cook for an additional 5-7 minutes or until the fish reaches 145ºF. Transfer to a plate and cover with aluminum foil to rest for 5 minutes.
While the fish is resting, heat the remaining butter and olive oil in the same skillet. Add the scallops and cook, without moving, for 1 1/2 minutes per side. Remove from heat.
To Serve:
Divide potatoes and sugar snap peas between plates. Place a filet of fish on top and arrange the scallops beside the fish. Spoon the beurre blanc sauce over top and garnish with microgreens. Enjoy with the remaining white wine!