Lemon Sheet Cake
Ingredients
Cake
2 cups (248g) all-purpose flour
1/4 cup (34g) cornstarch
3/4 tsp baking powder
1/2 tsp baking soda
1/2 tsp salt
1 1/2 cups (310g) granulated sugar
2 Tbsp (10g) lemon zest
3/4 cup (170g) unsalted butter
4 large eggs
1 tsp vanilla extract
1/2 cup (120ml) buttermilk
1/2 cup (120g) sour cream
2 Tbsp fresh lemon juice
Glaze and toppings
3 1/4 cups (390g) powdered sugar
1/3 cup (80ml) fresh lemon juice
Fresh strawberries, raspberries or blueberries for topping
Sliced lemons and mint leaves, for decoration (optional)
Instructions
Preheat oven to 350 degrees. Butter a rimmed 18 by 13-inch baking
sheet (average size cookie sheet), dust with flour then shake out
excess.
In a mixing bowl whisk together flour, cornstarch, baking powder,
baking soda and salt for 20 seconds, set aside.
In the bowl of an electric stand mixer fitted with the paddle
attachment, mix together sugar and lemon zest for 30 seconds until
fragrant and slightly yellow in appearance.
Add butter and whip mixture on medium speed until very pale and
fluffy. Mix in eggs one at a time then blend in vanilla extract.
In a bowl or 2-cup liquid measuring cup whisk together buttermilk,
sour cream and 2 Tbsp lemon juice. Add 1/3 of the flour mixture to
the butter mixture and mix on low speed just until combined then add
in 1/2 of the buttermilk mixture and mix just until combined.
Repeat once more with flour and buttermilk then end by mixing in last
1/3 of the flour mixture just until combined. Scrape down sides and
bottom of bowl with a rubber spatula and fold batter several times to
ensure it's evenly incorporated.
Pour and spread batter evenly onto prepared baking sheet . Bake
25 minutes until toothpick inserted into center comes out clean. Cool
completely on a wire rack.
In a mixing bowl whisk together powdered sugar and lemon juice until
smooth .
Pour and spread glaze over cooled cake. Chill 20 minutes to help set
glaze . Top with berries, lemon slices and mint just before serving.
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