Filo parcels of Comté, courgettes, spinach & leeks recipe

Ingredients

• 2 tablespoons light olive oil
• 2 leeks, trimmed and washed thoroughly, then finely sliced
• 2 courgettes, coarsely grated and placed in a sieve to drain excess liquid
• 80g baby leaf spinach, washed and roughly chopped
• 200g medium Comté (12 to 18-month), cut into 1cm cubes
• 7 sheets filo pastry, measuring about 25x45cm
• 75g unsalted butter, melted
• Optional: 1 or 2 slices of ham, finely chopped