Well ahead, make the spiced tomatoes: preheat the oven to 150°C/300°F/gas 2. Spread the seasonings over the base of a tray. Lay the tomato halves on top, skin-side up, and three-quarters cover with the oil. Cook in the low oven for 30 minutes, until the tomato skins are easily removed. Leave to cool slightly and remove all skins and any pips. Put the tomatoes in a clean