Preheat the oven to 340F (170C). Grease and line the bottom of an 8-inch (20 cm) pan with parchment paper.
Separate whites from yolks.
In a medium bowl mix yolks with 1/4 cup (50g) sugar, lemon zest and vanilla extract, until creamy and pale yellow colored. Gradually mix in oil and then add water.
Incorporate the baking powder and flour into the yolk mixture and set aside.
In a large bowl mix egg whites with salt until foamy. Gradually add the remaining 1/4 cup sugar (50g).
Continue mixing until soft peaks form.
Gently fold a spoon of whipped whites into the yolk mixture and then gently fold the yolk mixture into the whipped whites.
Place the chopped strawberries into a bowl and toss with 2 tablespoons of flour.
Gently fold the strawberries into the batter.
Pour the batter into the prepared pan.
Bake for 35-40 minutes, until a toothpick inserted into the center comes out clean.
Let it cool for about 10 minutes. Remove from the pan and cool completely on a rack.