Grease the base of a tagine or large overproof dish with 1 tablespoon of the oil.
Arrange most of the tomato slices over the base and sprinkle over half the garlic and chillies.
Place the fish in a single layer on top of the tomatoes, scatter over the remaining garlic and chillies and arrange the remaining tomato slices on top of the fish.
Mix the remaining olive oil together with the lemon juice in a small bowl.
Pour the mixture over the fish and tomatoes and season.
Cover and place in a preheated oven, 180°C , Gas Mark 4, for 20 minutes.
Scatter the butter over the tomatoes and sprinkle the cinnamon and sesame seeds over the top.
Return the tagine to the oven, uncovered, for 10 minutes until the fish is cooked through.
Serve with couscous and a salad, if liked.
Notes / Tips / Wine Advice:
For fish with baked tomato & cinnamon purée,
bake 5–6 tomatoes in an ovenproof dish in a preheated oven, 180°C , Gas Mark 4, for 15–20 minutes until the skins wrinkle. Remove the skin from the tomatoes, cut into quarters and deseed, then dice the flesh. Put the tomatoes into a food processor or blender and process to a smooth purée. Add 2 teaspoons honey and 1 teaspoon ground cinnamon to the purée and season with salt and pepper. Place 700 g firm-fleshed fish fillets in the base of a tagine and pour over the tomato purée, adding add a little water, if necessary, to cover the fish. Cover and place in a preheated oven, 180°C , Gas Mark 4, for 20 minutes until the fish is cooked through.