Creamy Chicken Liver Mousse

Name: Creamy Chicken Liver Mousse
Ingredients: 1 1/4 pounds chicken livers, trimmed, at room temperature; 8 large egg yolks, at room temperature; 2 tablespoons brandy; 2 tablespoons Calvados or other apple brandy; 1 tablespoon salt; 1 1/2 teaspoons freshly ground white pepper; 3/4 teaspoon ground allspice; Pinch of freshly grated nutmeg; 3 sticks (3/4 pound) unsalted butter, cut into tablespoons, at room temperature; 2 cups heavy cream; Toasted baguette slices, for serving; Sweet-and-Sour Red-Onion Relish , for serving