Apple and Chicken Liver Mousse

Heat the oven to 350 degrees.
Liberally coat the livers with sea salt and pepper; set aside on a plate. Peel and core the apples and cut into 1/4-inch dice. Chop the shallots.
Spread the walnuts on a baking sheet and lightly toast in the oven, 5 to 8 minutes, stirring occasionally; transfer to a plate.
In a large heavy enameled or other nonreactive skillet, heat the oil until it almost begins to smoke. Add the livers and stir them rapidly to sear, then cook for about 4 minutes, turning once. Remove the livers to a plate just when they become mahogany colored.
Add the apples and shallots to the skillet and cook for 5 minutes, or until softened. Turn off the heat, and carefully pour in the Calvados and cognac. Stir in the cream.
Melt the butter and let cool.
Combine the livers, apple mixture, and walnuts in a blender and puree just until the mixture is homogenous. Add the melted butter and blend well, then season to taste with salt and pepper. If you want the mousse to be very smooth, pass it through a fine-mesh sieve. Taste again for salt and pepper, transfer to a ceramic crock, and refrigerate for up to 2 days. Serve with the walnut toast.