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Steep the saffron in 60ml warm water for at least 10 minutes.
Heat 1 tsp olive oil in a pan and sauté the chopped onion for 3 minutes, then add 1 clove of minced garlic and sauté 1 minute more.
Add the tomato sauce, the saffron water from step 1, and the star anise, sprinkle with pepper, and simmer for 3 minutes.
Add the cod, cover, and cook over low heat for 6-7 minutes, basting with the sauce partway through.
Remove the star anise and transfer to a bowl. Drizzle with 1 tsp olive oil and top with lemon zest, lemon juice, and chopped parsley.
Toast the sourdough until crisp, rub the cut side of the remaining garlic clove over it, and serve alongside.