French Vanilla Cake with Lavender Lemon Frosting

French Vanilla Cake with Lavender Lemon Frosting

There are people in your life who remind you of sunshine, and when someone like that has a birthday, you do not reach for a box mix. You go to the kitchen, you clear the counter, and you make something worthy of them.

My sweet friend is one of those people — the kind of warmth that makes a room feel different, the kind of presence that makes everything a little lighter just by being in it. So when her birthday came at the very beginning of spring, I knew exactly what I wanted to make. Something that tasted like the season. Something that felt like her. A French vanilla cake, from scratch. With a lavender lemon frosting, from scratch. And a lavender simple syrup — also from scratch, because once I had decided to make something beautiful, I did not want to stop anywhere along the way.

On making the lavender syrup.

This is the part that makes the whole thing. Equal parts water and sugar, brought slowly to a simmer, with dried culinary lavender steeped in it until the kitchen smells like Provence and something inside you goes very still and very happy. You strain it, you let it cool, and then you brush it over each layer of cake before the frosting goes on — and what it does to the crumb is quiet and extraordinary. It keeps everything moist and tender, and it carries that soft floral note all the way through so that the lavender is never just in the frosting, it is in the whole cake.

On the cake itself.

French vanilla is not just vanilla with a different name. The addition of egg yolks is what makes it — they give the crumb a richness and a warmth, a golden color and a depth that regular vanilla cake simply does not have. I creamed the butter and sugar until the mixture was genuinely pale and light, which takes longer than you think it will and is more worth it than you can imagine. Real vanilla bean paste, not extract, because for a birthday cake made for someone you love, you use the real thing.

On the frosting.

Lavender lemon buttercream is one of those combinations that sounds almost too pretty to taste as good as it does, and then it does. I made a lavender-infused butter by warming softened butter gently with dried lavender, straining it, and letting it firm back up before whipping it into the frosting base — which means the floral flavor goes all the way through in a way that no amount of extract can replicate. Fresh lemon zest and a little lemon juice cut through the sweetness and keep everything bright. The result is soft and fragrant and just barely purple in the most beautiful way, the color of early spring before the full bloom arrives.

The recipe.

Makes one three-layer 8-inch cake

For the lavender simple syrup

• 1 cup water
• 1 cup cane sugar
• 3 tablespoons dried culinary lavender

Combine water and sugar in a small saucepan over medium heat, stirring until sugar dissolves. Add lavender and bring to a gentle simmer. Remove from heat, cover, and steep for 20 minutes. Strain through a fine mesh sieve and allow to cool completely before using. Store any extra in a glass jar in the refrigerator for up to two weeks — it is wonderful in lemonade, in sparkling water, in your morning tea.

For the French vanilla cake

• 3 cups all-purpose flour
• 1 tablespoon baking powder
• ½ teaspoon sea salt
• 1 cup unsalted butter, room temperature
• 2 cups cane sugar
• 4 large egg yolks plus 2 whole eggs, room temperature
• 1 tablespoon pure vanilla bean paste
• 1 cup whole milk, room temperature
• ¼ cup sour cream, room temperature

Preheat oven to 350°F. Grease and flour three 8-inch round cake pans and line with parchment. Whisk together flour, baking powder, and salt in a bowl and set aside. In a large bowl, beat butter and sugar together on medium-high speed for a full five minutes, until the mixture is very pale, light, and fluffy — this step matters, do not rush it. Add egg yolks and whole eggs one at a time, beating well after each addition. Beat in vanilla bean paste. Whisk together milk and sour cream. Add the flour mixture in three additions, alternating with the milk mixture, beginning and ending with flour. Mix until just combined. Divide batter evenly among prepared pans and bake 28–32 minutes until a toothpick inserted in the center comes out clean and the tops are just barely golden. Allow to cool in pans for 10 minutes before turning out onto a wire rack to cool completely. Once cooled, brush each layer generously with the lavender simple syrup and allow it to soak in for at least 15 minutes before assembling.

For the lavender lemon buttercream

• 1 cup unsalted butter, softened
• 2 tablespoons dried culinary lavender
• 4 cups powdered sugar, sifted
• Zest of 2 lemons
• 2–3 tablespoons fresh lemon juice
• Pinch of sea salt
• 1–2 drops purple food coloring, optional

In a small saucepan over very low heat, combine butter and lavender. Warm gently for 8–10 minutes — do not let it bubble. Strain through a fine mesh sieve, pressing the lavender to extract as much flavor as possible. Transfer lavender butter to the refrigerator until firm again, about one hour. Once firm, beat lavender butter on medium-high speed until light and fluffy. Add powdered sugar one cup at a time, beating well between additions. Add lemon zest, lemon juice, and salt, and beat until smooth and spreadable. Add a single drop of purple food coloring if you would like that soft lavender hue, and beat to combine.

To assemble.

Place the first cake layer on your serving plate or cake board. Spread a generous layer of buttercream over the top. Repeat with the second and third layers. Apply a thin crumb coat all over the outside of the cake and refrigerate for 20 minutes. Finish with a final layer of frosting, as smooth or as swooped and textural as feels right to you. Decorate with fresh or dried lavender, lemon slices, or edible flowers if you have them.

Serve at room temperature. This cake keeps beautifully covered at room temperature for two days, or refrigerated for up to five.

She deserved every minute of it. That is the whole point of making something from scratch — not efficiency, not convenience, but the particular care of deciding that someone is worth the time. Spring came in exactly the right way that day.