• 2 large eggs
• 8 tablespoons (120 g) sugar
• 1 teaspoon vanilla sugar or vanilla extract
• A pinch of salt
• 8 tablespoons (120 ml) vegetable oil
• 8 tablespoons (120 ml) milk
• Zest of 1 lemon
• 8 tablespoons (120 ml) lemon juice
• 8 tablespoons (100 g) flour
• 1 teaspoon baking powder
• 400 g fresh plums, pitted and chopped
• 1 tablespoon cornstarch

For the Crumble Topping:

• 3 tablespoons (45 g) flour
• 2 tablespoons (30 g) sugar
• 1 tablespoon (15 g) butter

1. In a mixing bowl, beat the eggs, sugar, vanilla sugar (or extract), and a pinch of salt until light and frothy.
2. Pour in the vegetable oil, milk, lemon zest, lemon juice, flour, and baking powder. Mix until a smooth batter forms.
3. Pit the plums and finely dice half of them. Fold the diced plums into the batter gently.
4. Grease a baking pan with butter and pour the batter into it evenly.
5. Slice the remaining plums and arrange them evenly over the batter in the pan.
6. In a separate bowl, mix together the flour, sugar, and butter to create the crumble topping. Sprinkle it over the sliced plums.
7. Bake in a preheated oven at 180°C (350°F) for about 40 minutes, or until golden brown and a toothpick inserted comes out clean.
8. Allow the cake to cool slightly before slicing and enjoying!