Stand mixer or handheld beater with whisk and paddle attachments
Ingredients
Eggs
4largeeggsroom temperature
Baking Ingredients
¼teaspooncream of tartaroptional
¾cupsugar
½teaspoonkosher salt
½cupunsalted buttermelted and cooled (1 stick)
1teaspoonvanilla paste or extract
¾cupall-purpose floursifted
¼cuplemon juicefrom about 2 large lemons
2tablespoonsfinely grated lemon zestfrom about 2 large lemons
1 ¾cupwhole milkroom temperature
powdered sugarfor dustingoptional
Instructions
Cooking Instructions
Preheat oven to 325°F (165°C) and line an 8×8 inch baking dish with parchment paper.
Separate eggs, adding whites to stand mixer bowl with whisk attachment. Add cream of tartar and whisk on medium-high until stiff peaks form (3 to 5 minutes). Transfer to another bowl.
Add yolks to mixing bowl (no need to clean), whisk on medium-high until foamy (about 1 minute). Drizzle in sugar while mixing until creamy and light in color (2 to 3 minutes). Add salt, butter, and vanilla, beating for 1-2 minutes.
Switch to paddle attachment, add flour, mix on medium-low until smooth. Add lemon juice and zest, then milk, mixing until combined. Scrape the bowl to ensure well combined.
Gently fold in a third of the egg whites, repeat until all whites are incorporated, being careful not to over mix.
Pour batter into prepared pan and bake for 45 to 55 minutes, until lightly golden and center jiggles slightly.
Cool completely at room temperature. Cover and refrigerate for at least 1 hour or overnight. Sprinkle with powdered sugar before serving.
Notes
Store leftover cake sealed in plastic wrap in refrigerator for up to 1 week or in freezer for up to 3 months.