Curried lamb shanks

Ingredients

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