Savoury spiced baklava

Name: Savoury spiced baklava
Ingredients: 1kg butternut squash peeled and diced; olive oil; 400g tin chickpeas drained and rinsed; 2 tsp cumin seeds; 2 tbsp harissa; 3 onions finely chopped; 1 leek white part chopped; 2 cloves garlic crushed; 180g pack cooked and peeled chestnuts chopped; 150g soft white breadcrumbs; a handful coriander finely chopped; 50g sultanas; 100ml vegetable stock hot; 2 x 270g packs filo pastry; 75g butter melted; 200g feta crumbled; 1 tsp black onion seeds or black sesame seeds; to drizzle runny honey; a pinch dried chilli flakes (optional); sea salt flakes