Preheat oven to 150C/300F
Grease and line a 24cm/10 inch spring form cake tin.
Divide the nut mixture into 4 equal parts.
Add 1/4 of the nut mixture to the base of the tin and press into place.
Add the squash mixture and spread to cover the nut layer.
Add the next 1/4 of the nut mixture and press into place to cover the squash.
Add the spinach and spread to cover the nut layer.
Add the next 1/4 of the nut mixture and press into place to cover the spinach layer.
Add the beetroot mixture and spread to cover the nut mixture.
Add the final 1/4 of the nut mixture and press into place.
Cover with a circle of baking parchment.
Roast in the preheated oven for 45 minutes. Remove the paper circle after 30 minutes to allow the top to brown.
Remove from the oven and allow to cool for 10 minutes in the tin before unclipping, removing the baking parchment and revealing your creation!
Serve, hot, cold or at room temperature.