Combine the softened butter and icing sugar. Add an egg and mix in well. Put the flour and orange zest in. Make the dough. Keep in the fridge for 2 hours before rolling out to 2.5mm thickness. Cut out using a no.6 cutter. Oven bake on a Silpain baking mat for 15 mins at 293°F.
Peel the butternut squash and cut into large chunks. Cook wrapped in kitchen foil at 392°F. Once the flesh is cooked, sieve and drain well. Heat 1/3 of the milk with the purée in a saucepan. At the same time, boil the rest of the milk. Beat the egg yolks and sugar until pale. Add the custard powder. With the milk at boiling point, pour in 1/3 of the egg mixture. Combine the two in a saucepan. Bring to boil and cook for 3 mins. Then add the butter and the gelatine. Cover the surface with film and leave to cool. Whip together the cream, sugar and cinnamon. Mix this cream with the cooled mixture. Place in a piping bag fitted with a plain no. 9 nozzle.
Beat together the cream, sugar, zest and Grand Marnier (optional). Place in a piping bag fitted with a plain no. 9 nozzle.
Boil the orange purée, water, lime juice and the zests. With the liquid hot, add in the stabiliser, glucose and Grand Marnier. Place in an ice-cream maker.
Warm the fruit pulp and sprinkle in the pectin from above. Cook for 2 mins after reaching boiling point and transfer to a pipette.
Peel and dice the butternut squash. Cook in a little water and butter and finish with a coating of honey.
Create the millefeuille by laying a biscuit and then piping the cream. Repeat once. Place a yellow-coloured white chocolate disk the same size as the biscuits on top and pierce various sized holes. Drizzle the coulis on the plate and arrange the millefeuille. Line up the pieces of butternut squash, orange segments and the orange Chantilly cream. Use the leftover biscuit to secure the sorbet quenelle.