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Preheat oven to 350 degrees farenheit, line a 9x9 square baking dish with parchment paper.
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In a medium sized bowl, whisk together flour, cornstarch, sugar, baking soda and salt.
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Zest the lemon over the flour mixture and whisk.
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Add milk, oil, lemon and vanilla extracts and stir a few times.
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Add lemon juice (or vinegar) and stir a few more times.
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Immediately pour the batter into a parchment lined pan, trim any excess parchment paper, and place in the oven on a middle rack.
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Bake for 25-30 minutes until the cake is golden brown and a toothpick inserted into the center comes out clean.
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Let it cool completely by placing the pan on a wire rack.
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Serve plain, or dust with powdered sugar, or drizzle with lemon icing (1/2 cup of powdered sugar + 1 tablespoon lemon juice, whisk).