Curried lamb shanks

Ingredients

• 8 french-trimmed lamb shanks (1.5kg)
• 1/4 cup (35g) plain flour
• 2 tablespoon peanut oil
• 1 medium brown onion (150g), chopped finely
• 2 clove garlic, crushed
• 1/2 cup (150g) rogan josh curry paste
• 2 cup (500ml) water
• 400 gram can crushed tomatoes
• 1 teaspoon sugar
• 2 cup (500ml) beef stock
• 400 gram cauliflower, chopped coarsely
• 400 gram pumpkin, chopped coarsely
• 3/4 cup (150g) red lentils
• 1/4 cup coarsely chopped fresh coriander