Preheat your oven to 170°C (338°F). Grease and line a 20x20 cm baking pan with parchment paper.
In a small bowl, combine lemon juice and milk, and set aside to curdle slightly. This adds extra moisture and flavor to the cake.
In a large bowl, cream together the butter, vegetable oil, and sugar until light and fluffy.
Add the eggs, one at a time, mixing well after each addition.
Stir in the vanilla extract and lemon juice.
In a separate bowl, sift together the plain flour, baking powder, and a pinch of salt.
Gradually fold the dry ingredients into the wet mixture, alternating with the milk mixture, until smooth and lump-free.
Pour half of the batter into the prepared pan, spreading it evenly.
Spread the strawberry jam over the first layer of batter, then carefully pour the remaining batter on top, smoothing it out with a spatula.
Bake for 30-35 minutes or until a cake tester inserted in the center comes out clean.
While the cake bakes, prepare the frosting by beating together cream cheese, butter, and powdered sugar until creamy and smooth.
Once the cake has cooled, generously spread the frosting on top for a delicious finish.
For extra lemon flavor, you can drizzle a simple lemon glaze (a mix of lemon juice and powdered sugar) over the frosting or garnish with fresh strawberries for a vibrant, fruity twist.
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