Ingredients:
- FOR THE CAKE:
- 16 tbsp. unsalted butter, softened, plus more for pans
- 2½ cups cake flour, sifted, plus more for pans
- 2½ tsp. baking powder
- 1 tsp. kosher salt
- ½ cup milk
- 1 tsp. vanilla extract
- 1½ cups sugar
- 2 tbsp. lemon zest, plus 2 tbsp. juice
- 4 eggs
- FOR THE CURD:
- ½ cup sugar
- 1 tbsp. lemon zest, plus ⅓ cup juice
- 3 eggs
- 8 tbsp. unsalted butter, cubed and chilled
- FOR THE BUTTERCREAM AND GARNISH:
- ¾ cup sugar
- 3 egg whites
- 20 tbsp. unsalted butter, softened, plus 4 tbsp., melted
- 2 oz. white chocolate, melted and cooled
- 1 tsp. vanilla extract
- ⅛ tsp. kosher salt
- ¾ cup finely ground graham crackers
- Candied lemon slices, to garnish (optional)