Red Grape and Olive Oil Cake

Name: Red Grape and Olive Oil Cake
Prep time: 15 min
Cook time: 1 h 40 min
Total time: 1 h 40 min
Yield: 12 slices
Ingredients: olive oil; 100 g olive oil; 3 large eggs; 190 g caster sugar; 120 g milk; 1 tsp natural vanilla extract; ½ lemon; 200 g self-raising flour; 90 g maize flour; 1 pinch fine sea salt; 1 tsp baking powder; 280 g seedless red grapes; 2 Tbsp icing sugar