Lamb shanks massaman

Name: Lamb shanks massaman
Prep time: 30 min
Cook time: 2 h 50 min
Total time: 3 h 20 min
Cuisine: Asian
Ingredients: 1 tablespoon vegetable oil; 8 french trimmed lamb shanks (2kg); 2 brown onions (400g), chopped coarsely; 1/2 cup (150g) massaman curry paste; 400 millilitre can coconut milk; 2 tablespoon tamarind concentrate; 2 cup (500ml) beef stock; 700 gram piece pumpkin, trimmed, cut into 2cm cubes; 1/4 cup (35g) roasted unsalted peanuts, chopped coarsely; 2 green onions, sliced thinly