Heat up a small quantity of olive oil in a large pan and fry courgette with garlic. 
Crush the chickpeas to a purée and add courgettes, herbs, powdered curry, salt and pepper and knead to produce a homogeneous and thick mixture (add breadcrumbs if needed). 
Shape this mixture into a hamburger and fry until it is golden-brown on both sides.
Cook two Rösti Toasties and place the hamburger in-between.
Serve with green salad and a fresh lemon-based salad dressing.