SERVES 4 INGREDIENTS 400g chuck beef, diced • 400g beef rump steak, diced • 2 tsp fine salt • 2 tsp Herbes de Provence • cooking oil spray • 4 slice Provolone cheese • 4 crusty rolls, split • 2 Tbsp aioli • 1 Tbsp seeded mustard • 1 cup radicchio leaves, torn • 2…