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1
For the cake: Position an oven rack in the lower third of the oven and preheat to 350 degrees F. Butter the bottom and sides of a 9-by-13-inch pan.
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2
Whisk the flour, baking powder, baking soda and salt in a medium bowl; set aside.
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3
Whisk the buttermilk and vanilla in a spouted measuring cup; set aside.
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4
Beat the sugar and butter in a stand mixer (or a large bowl if using a hand mixer) at medium speed until very light in color and fluffy, about 5 minutes, scraping down the side of the bowl as needed.
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5
Slowly add the eggs and beat until fully incorporated.
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6
Reduce the speed to the lowest setting; with the mixer running, alternate beating in the flour mixture in three additions and the buttermilk mixture in two, starting and ending with the flour mixture.
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7
Scrape down the side of the bowl, and beat until the batter is well mixed.
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8
Spread into the prepared pan.
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9
Bake the cake until golden brown and a toothpick inserted in the center comes out clean, about 30 minutes, rotating the pan halfway through.
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10
Let cool in the pan for 30 minutes.
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11
Using a fork, poke holes in the top and all the way through the cake.
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12
Bring 1 cup water to a boil, pour over the gelatin in a small bowl and stir until completely dissolved, about 2 minutes.
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13
Stir in 1/2 cup cold water.
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14
Pour the mixture evenly over the cooled cake.
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15
Refrigerate for 2 hours.
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16
Put a large bowl (for whipping the cream) in the refrigerator.
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17
For the sweetened berries: While the cake chills, hull and quarter the strawberries.
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18
Toss with the granulated sugar in a medium bowl, and set aside until soft and juicy, about 1 hour.
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19
For the topping: Remove the cake from the refrigerator.
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20
Whip the cream with the sugar and vanilla in the chilled bowl until fluffy.
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21
Spread it over the cake, slice the cake and serve with the strawberries.