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Heat oven to 220C/200C fan/gas 7. Put the squash on a baking tray. Toss in half the oil, season and spread out into a single layer (you may need 2 baking trays). Roast for 30-35 mins or until tender.
Meanwhile, place a large rectangle of baking parchment on a baking tray. Unroll the pastry and lay it on top. Score a 1cm border with the tip of a knife and prick the inside part all over with a fork. Bake in the oven for 15 mins.
Mix the ricotta, sage, nutmeg, lemon zest and plenty of seasoning in a bowl. Once the pastry and squash are cooked, remove from the oven. Gently press the centre of the pastry case down with the back of a spoon. Spread the ricotta mix into the centre. Lay on squash Bake for a further 10-15 mins until the pastry is golden and crisp. Mix the lemon juice, rocket, chilli, pine nuts and 1 tbsp oil. Scatter half over the tart and serve the rest on the side.