Spiderweb Spice Cake

INGREDIENTS

• 1 1/2 sticks (6 oz.) unsalted butter, at room temperature
• 1 1/2 cups sugar
• 2 eggs, at room temperature
• 1/2 cup sour cream
• 2 tablespoons unsweetened Dutch-process cocoa powder
• 1 1/2 teaspoons baking soda
• 1 teaspoon ground allspice
• 1 teaspoon ground cinnamon
• 1 teaspoon ground ginger
• 1/2 teaspoon salt
• 3 apples, peeled and grated (2 cups)
• 1 3/4 cups flour
• 1 cup raisins
• 1 cup coarsely chopped pecans
• 2 sticks (1/2 lb.) unsalted butter
• 1 cup (packed) dark brown sugar
• 1/4 cup whole milk
• 2 1/4 cups confectioners' sugar
• 1 teaspoon vanilla extract
• Orange food coloring
• 1 tube black icing
• Peanut or almond M&M's