01 - Preheat oven to 350°F. Grease and flour two 9-inch round cake pans.
02 - Sift together flour, cocoa powder, sugar, baking powder, baking soda, and salt in a large bowl.
03 - Add eggs, milk, oil, and vanilla to the dry ingredients. Beat on medium speed until well combined. Gradually add boiling water, mixing until the batter is smooth (it will be thin).
04 - Divide the batter evenly between the prepared pans. Bake for 30–35 minutes or until a toothpick inserted in the center comes out clean.
05 - Let cakes cool in the pans for 10 minutes, then turn out onto a wire rack to cool completely.
06 - Heat the cream in a small saucepan until it just begins to simmer. Pour over chopped chocolate in a bowl. Let sit for 2–3 minutes, then stir until glossy and smooth. Cool until thickened but spreadable.
07 - Toss sliced strawberries with sugar, if desired, and let sit for 10 minutes to soften slightly.
08 - Spread a layer of ganache over the first cake layer, top with half the sliced strawberries. Place the second cake layer on top, spread remaining ganache evenly, and arrange more strawberries on top. Decorate with extra whole or halved strawberries.
09 - Chill for at least 30 minutes before slicing for clean layers.