Delicious spiced vegetable rolls, perfect for picnics

Ingredients

• 1/2 (about 375g) medium butternut squash, peeled and cut into roughly 1cm chunks
• 1 red pepper, cut into roughly 1cm chunks
• 1 large red onion, peeled and cut into roughly 1cm chunks
• 2 tbsp Steenbergs organic harissa with rose
• 2 tbsp olive oil
• 100g feta, crumbled (or use a vegan alternative)
• a large handful fresh dill, roughly chopped
• 320g ready rolled sheet of puff pastry
• 1 medium egg, beaten
• 1 tsp Steenbergs organic nigella seeds