Savoury pie with vegetable ratatouille (aubergines, courgettes, peppers, onions) and Grana Padano Riserva

Ingredients

• 1 roll of shortcrust pastry, rolled out
• 150 g Grana Padano PDO Riserva over 20 months
• 1 aubergine
• 1 yellow pepper
• 1 red pepper
• 4 courgettes
• 1 red onion
• 1 bunch basil
• 1 tablespoon extra virgin olive oil
• salt and pepper to taste