For the Batter:
- 4 large eggs (separated into yolks and whites)
- 1 cup (240g) natural yogurt or plain Greek yogurt
- 1/2 cup (100g) granulated sugar (divided for yolks and whites)
- 1/3 cup (80ml) neutral vegetable oil or melted unsalted butter
- Zest of 2 fresh lemons (finely grated)
- 3 tablespoons fresh lemon juice
- 1 teaspoon pure vanilla extract
- 1 cup (120g) all-purpose flour (or cake flour for an even finer crumb)
- 1 teaspoon baking
- powder
- 1/4 teaspoon salt
- 1/4 teaspoon cream of tartar (helps stabilize the whipped egg whites)
Step-by-Step Baking Instructions
Baking a cake with a soufflé-like texture requires patience and gentle handling. Follow these steps carefully for professional results:
Step 1: Prep Your Pan and Oven
- Preheat your oven to 325°F (160°C).
- Prepare a round 8-inch cake pan (preferably with solid sides rather than a loose bottom if baking in a water bath, or wrap a springform pan tightly in multiple layers of heavy-duty aluminum foil to prevent
- water leakage).
- Grease the bottom and sides of the pan with butter and line the bottom with parchment paper.
Step 2: Prepare the Yogurt and Egg Yolk Base
- In a large mixing bowl, whisk together the egg yolks, half of the granulated sugar (1/4 cup), vegetable oil, lemon zest, lemon juice, vanilla extract, and natural yogurt until completely smooth and creamy.
- Sift the all-purpose flour, baking powder, and salt directly into the wet yogurt mixture.
- Gently whisk until just combined and no flour lumps remain. Do not overmix, or
- the cake will lose its tender crumb.
Step 3: Whip the Meringue
- In a separate, scrupulously clean glass or metal bowl, beat the egg whites using an electric hand mixer or stand mixer on medium speed until frothy.
- Add the cream of tartar.
- Gradually add the remaining granulated sugar (1/4 cup) while continuing to whip on medium-high speed.
- Continue whipping until the egg whites form stiff, glossy peaks that hold their shape when you lift the beaters straight up.
Step 4: Gently Fold the Meringue
- Add about one-third of
- water leakage).