Slow-cooker Indian beef

Name: Slow-cooker Indian beef
Prep time: 15 min
Cook time: 5 h 50 min
Total time: 6 h 5 min
Cuisine: Indian
Ingredients: 1/4 cup plain flour; 800g diced beef chuck steak; 2 tbsp vegetable oil; 1 large brown onion, cut into thin wedges; 2 garlic cloves, crushed; 4cm piece fresh ginger, peeled, grated; 1 long red chilli, finely chopped; 1/4 cup Rogan Josh curry paste; 400g can diced tomatoes; 1 cinnamon stick; 2 cardamom pods, bruised; 1/2 cup chopped fresh coriander leaves; Warmed naan bread, to serve