Prepare the cake pans by greasing them and lining with parchment paper. Preheat oven to 350°F (175°C).
5 cups All-purpose flour, 4 cups Granulated sugar, 5 teaspoons Baking powder, 1 teaspoon Salt
In a large bowl, sift together flour, baking powder, and salt. Set aside.
5 cups All-purpose flour, 5 teaspoons Baking powder, 1½ cups Unsalted butter softened
In the bowl of a stand mixer fitted with the paddle attachment, cream butter and sugar together until light and fluffy, about 5-7 minutes.
4 cups Unsalted butter softened and cubed, 3 cups Granulated sugar
Add eggs one at a time, mixing well after each addition. Scrape down the sides of the bowl as needed.
8 Large eggs room temperature
Alternately add the dry ingredients and milk to the butter mixture, beginning and ending with the dry ingredients. Mix until just combined after each addition.
2 cups Whole milk room temperature
Add vanilla extract and mix until incorporated. Be careful not to overmix.
2 tablespoons Pure vanilla extract
Divide batter among prepared heart-shaped pans, filling each about two-thirds full. Smooth the tops with an offset spatula.
Bake until a toothpick inserted into the center comes out clean (approximately 25-35 minutes for 8-inch cakes, 35-45 minutes for 10-inch, and 45-55 minutes for 12-inch).
Allow cakes to cool in pans for 15 minutes, then remove and cool completely on wire racks.
Level each cake layer with a cake leveler or serrated knife, then slice each layer horizontally to create two even layers from each cake.
Prepare Swiss meringue buttercream by combining egg whites and sugar in the bowl of a stand mixer. Place over a pot of simmering water to create a double boiler.
12 Large egg whites, 4 cups Granulated sugar
Whisk the egg white mixture constantly until it reaches 160°F (71°C) and the sugar has completely dissolved.
12 Large egg whites, 4 cups Granulated sugar
Transfer the bowl to the stand mixer fitted with the whisk attachment and beat on high speed until stiff, glossy peaks form and the mixture has cooled to room temperature.
Switch to the paddle attachment and add butter, a few cubes at a time, mixing well after each addition. Continue beating until smooth and creamy.
1½ cups Unsalted butter softened
Add vanilla extract and salt, mixing until fully incorporated. Tint a small portion with ivory food coloring if desired for a vintage effect.
2 tablespoons Pure vanilla extract, ½ teaspoon Salt, 1 bottle Ivory gel food coloring
Place a dollop of buttercream on each cake board and arrange the bottom layer of each tier, cut side up. Fill with buttercream between layers.
Swiss Meringue Buttercream
Apply a thin crumb coat of buttercream to each assembled tier, then refrigerate for 30 minutes until firm.
Swiss Meringue Buttercream
Apply a final smooth layer of buttercream to each tier, using a bench scraper to create clean edges. Chill for at least 1 hour.
Swiss Meringue Buttercream
Prepare royal icing by combining confectioners' sugar and meringue powder in a stand mixer. Gradually add warm water while mixing on low speed.
4 cups Confectioners' sugar sifted, 3 tablespoons Meringue powder, ⅓-½ cup Warm water
Add cream of tartar and clear vanilla extract, then increase speed to medium-high and beat for 5-7 minutes until stiff peaks form.
½ teaspoon Cream of tartar, 1 teaspoon Clear vanilla extract
Cover royal icing with a damp cloth when not in use to prevent drying out.
Royal Icing for Decoration
Insert dowels into the bottom and middle tiers for support, trimming them level with the top of each tier.
Begin decorating with royal icing using Lambeth piping techniques. Start with basic borders around the edges of each tier.
Royal Icing for Decoration
Create delicate scrollwork following the curves of the heart shape, building up layers for dimension.
Royal Icing for Decoration
Add overpiped borders with scalloped edges and stringwork connecting decorative elements.
Royal Icing for Decoration
Pipe small royal icing flowers or leaves as accent decorations where appropriate.
Royal Icing for Decoration
Place sugar pearls strategically to enhance the piping details and add elegance.
2 cups Sugar pearls various sizes
Apply petal dust and lustre dust with a soft brush for subtle vintage coloring and sheen if desired.
1 bottle Petal dust for vintage effect, 1 container Edible lustre dust optional
Stack the tiers carefully, centering each heart on the tier below.
Allow the cake to settle at room temperature for 1-2 hours before serving. Display on a vintage or antique cake stand for maximum impact.