Indian Shrimp Curry with Cauliflower and Pumpkin

Name: Indian Shrimp Curry with Cauliflower and Pumpkin
Ingredients: 1 tablespoon coriander seeds; 1 tablespoon cumin seeds; 2 teaspoons fennel seeds; 1 teaspoon turmeric; 1/2 teaspoon salt; 1 tablespoon coconut oil (or canola); 2 tablespoons minced fresh ginger; 5 garlic cloves, minced; 1 yellow onion, finely sliced; 3 star anise; 2 cups cubed pumpkin (or squash); 2 teaspoons mustard seeds; 2 cups cauliflower florets; 1 teaspoon serrano chile, sliced lengthwise in half; 8 fresh curry leaves; 12 raw shrimp, cleaned; 1 tablespoon tamarind juice; 1 1/2 cans coconut milk (600 ml); 2 teaspoons sugar; 1 cup seafood stock (or water); Coriander, for serving