Preheat an oven to 375 degrees F. Season the fillets on both sides with salt and pepper.
Place a large, non-stick saute pan over very high heat. When hot, add the oil, and swirl to coat bottom of pan. Brush each fillet (skin-side only) generously with butter.
Place the fish fillets into the hot pan, skin side down, and brown for 2 minutes over high heat. Place the pan in the oven for 3 minutes. Serve warm from the oven, with Chive Whipped Potatoes, Truffle Vinaigrette, and Sauteed Shiitakes.
Chive Whipped Potatoes:
Put the potatoes in a saucepot and cover with cold water. Add salt and bring to a boil. Cook the potatoes until tender, about 15 minutes. Strain the water out of the pot and mash the potatoes with the cream, butter, salt and pepper. Stir in the chive oil and sliced chives, and serve.
Chive Oil: 1 cup vegetable oil, well chilled 1 bunch fresh chives, sliced into very fine pieces Salt
In a food processor, blend the oil and chives together. Season to taste with salt. Reserve the remainder in a plastic squeeze bottle, refrigerated.
Place chicken stock in a saucepan and reduce liquid to 1/2 cup. Place chopped shallots in a large, stainless steel mixing bowl, pour hot stock over them, and steep for 10 minutes. Add the vinegar, season to taste, and slowly add the oils, whisking constantly to emulsify. Set aside until ready to use.
Yield: 2 1/2 cups
Sauteed Shiitakes: 1 cup thinly sliced shiitakes 2 tablespoons olive oil 1 teaspoon butter Salt and pepper, to taste 2 tablespoons chopped shallots 2 teaspoons chopped garlic 1 teaspoon fresh thyme leaves 1/2 cup haricots verts, blanched 1/4 cup diced and seeded tomato
Saute the mushrooms in olive oil and butter. Season with salt and pepper. Add shallots, garlic, and thyme. Saute until shallots and garlic turn translucent. Add the haricots verts, combine and remove from heat. Stir in the dice tomato and serve.
To serve: mound hot mashed potatoes in center of plate. Top with 1 wild striped bass fillet, skin side up. Surround with truffle vinaigrette and shiitakes.