Step 1

Heat oven to 220C/200C fan/gas Heat 1 tbsp of the oil in a large, lidded frying pan or flameproof casserole dish. Cook the aubergine, in two batches, over a high heat for 4-5 mins until golden, adding extra oil as you need to. Return all the aubergine to the pan with the garlic, tomatoes and 1 1/2 tsp oregano and cook for 1 min. Stir in the spinach, put the lid on the pan and leave for a few mins to wilt.

Step 2

Add the flour and stir through until combined. Pour in the milk, stir gently and bring to the boil. Bubble for a few mins, then stir in the cheese and season. Cook until the cheese has melted and the sauce has thickened.

Step 3

Mix the mash with the remaining oregano and spread over the filling. Scatter over a little more grated cheese and bake for 10-15 mins until golden. The top can also be grilled rather than baked, but keep an eye on it as you may need to reduce the cooking time.