1.Preheat your oven to 200°C (400°F).
2.Slice the courgettes and potatoes thinly.
3.In a mixing bowl, combine the flour, salt, and black pepper. Gradually add in the water and olive oil to form a batter.
4.Fold in the sliced courgettes, potatoes, and chopped basil to the batter until evenly coated.
5.Pour the mixture into a greased tart or baking dish.
6.Bake in the preheated oven for 40-45 minutes or until golden and crispy on top.
7.Let it cool slightly before slicing and serving.