Prepare the butternut squash and toss it the oil, then add the sage and stir it in to coat the chunks of squash, then place onto a baking tray and roast for 15 minutes
Meanwhile, cook the diced leek, onion and garlic in a pan on a low heat with a little oil. Cook for 5-8 minutes until the leek and onion are softened. Then set aside to cool
Roll out the puff pastry sheet onto a baking tray, many come with baking paper attached but if not, line your tray first with baking paper
Prick the pastry all over with a fork, avoiding the border of the pastry
Spread the leek out evenly onto the pastry sheet, leaving a 1cm border around the edge
Arrange the butternut squash and stilton over the leek, then glaze the edge with the milk using a pastry brush
Bake the tart for 20-25 minutes until golden all over and the cheese is bubbling
Serve immediately, once fully cool store leftovers in the fridge for 2-3 days or freeze for up to 3 months
Notes
I use a ready rolled puff pastry sheet for this recipe, which is the easiest option. The majority of shop bought puff pastry sheets are vegetarian, and many are vegan now too.
Any stilton is suitable for this recipe, it's great if you have some leftover from a cheeseboard. You can swap it for another cheese if you prefer.
Although I provide cup measurements, I highly recommend weighing your ingredients out using digital kitchen scales. It is the most accurate way to measure ingredients and will ensure the best results. Digital scales are very low cost and can be purchased for around £12 ($16.50).
For teaspoon (tsp) and tablespoon (tbsp) measurements, please use measuring spoons and not the type of spoons you eat with. Again this will ensure accuracy and provide the best results.