To make the crust. In a food processor, combine the butter and horseradish. Process until mixture comes together. Add the bread crumbs in a stream and process until combined well. Transfer to a sheet of plastic, cover with another sheet of plastic and smooth into a thin layer and . Chill.;
Preheat the oven to 450 degrees F.
Cut the salmon fillet into 4 portions and season with salt and pepper. In a saute pan, over moderately high heat cook the butter and oil until hot and add the salmon. Sear both sides. Divide crust among salmon fillets and transfer to oven. Bake for 5 minutes.
Arrange cucumbers on a serving plate, top with the salmon, surround with sauce and sprinkle with chives.
To make the cucumbers: In a skillet set over moderate heat melt the butter, add the shallots and cook, stirring, until softened. Add the cucumbers and cook, stirring occasionally, for 3 to 4 minutes, or until just tender. Add the dill and chives.;
To make the sauce: In a skillet, melt the butter and shallots and cook, stirring occasionally, until softened. Add the vermouth and reduce by 1/2. Add the chicken stock and reduce until flavorful. Stir in the dill and chives.;
Recipe courtesy of Harold Moore, Montrachet Restaurant