Lightly grease a large roasting tray and put in the onion and garlic. Drizzle over the melted butter and give the onions a stir. Bake for 10–15 minutes, making sure they don’t begin to burn.

Preheat your oven to 190°C and line a large flat baking tray with parchment. Lay four of the small rectangles of filo onto the tray. Brush each sheet with oil and lay the other sheet on top at ...