01 - Preheat oven to 350°F (175°C). Grease and flour two 9-inch round cake pans, then line the bottoms with parchment paper for easy release.
02 - In a large mixing bowl, sift together the all-purpose flour, granulated sugar, unsweetened cocoa powder, baking powder, baking soda, and salt until evenly blended.
03 - Add the eggs, whole milk, vegetable oil, and vanilla extract to the dry mixture. Beat on medium speed until fully combined. Gradually pour in the boiling water while mixing until the batter is smooth and uniform. The batter will appear quite thin — this is expected.
04 - Divide the batter evenly between the two prepared cake pans. Bake for 30 to 35 minutes, or until a toothpick inserted into the center of each layer comes out clean. Allow the cakes to cool in their pans for 10 minutes, then invert onto wire racks to cool completely.
05 - While the cakes bake, combine the sliced strawberries with granulated sugar and lemon juice in a bowl. Set aside for at least 20 minutes to allow the fruit to release its natural juices and develop flavor.
06 - Heat the heavy cream in a small saucepan over medium heat until it just begins to simmer — do not boil. Remove from heat and pour over the finely chopped semisweet chocolate in a heatproof bowl. Let stand for 2 minutes, then stir gently until the mixture is glossy and smooth. Allow the ganache to cool and thicken slightly until it reaches a pourable consistency.
07 - If using the whipped cream topping, beat the heavy whipping cream with powdered sugar and vanilla extract using an electric mixer until soft peaks form. Be careful not to overwhip.
08 - Place one cooled cake layer on a serving platter. Arrange a generous layer of the macerated strawberries over the top, reserving a few for garnish. Drizzle half of the chocolate ganache over the strawberries. If desired, spread a layer of whipped cream over the fruit.
09 - Carefully position the second cake layer on top. Pour the remaining ganache over the top of the cake, allowing it to flow naturally down the sides. Arrange the reserved strawberries on top as garnish.
10 - Refrigerate the assembled cake for at least 1 hour to allow the layers to set properly. Slice into portions and serve chilled.