The tagine's conical shape makes a uniquely moist, hot cooking environment for the dish being cooked. Fish is well suited to this cooking method as it keeps the flesh tender and succulent. You could substitute any firm white fish for the snapper.
1.Blend or process chermoulla ingredients until smooth.
2.Combine fish and chermoulla in large bowl. Cover, refrigerate 30 minutes.
3.Heat half the oil in tagine or flameproof casserole dish, add potato; cook, stirring, about 10 minutes or until browned lightly. Cover; cook 5 minutes or until potatoes are almost tender.
4.Uncover potatoes; top with fish and tomatoes. Combine stock, tomato paste and sugar in medium jug; season. Pour stock mixture over fish in tagine; bring to the boil. Reduce heat; simmer, covered, about 20 minutes or until fish is cooked.
5.Serve tagine drizzled with remaining oil; sprinkle with herbs.