Preheat the oven to 200ºc.
Place a little olive oil in a hot frying pan and add the shallots and cook for a few minutes then add in the mushrooms and cook until softened and any excess liquid absorbed.
Add in the tarragon and toasted pine nuts, season with salt and pepper and stir then set aside.
Wash the spinach then wilt in a pan for a few minutes. Drain off any excess liquid. Season with cracked black pepper.
Peel the sweet potatoes and parsnips and cut out circles the diameter of the tower stacker ring - around 2cm in thickness.Set the tower stacking rings onto a baking tray. Place a circle of sweet potato in the base followed by a circle of parsnips. Top with some of the mushroom mix and then the spinach and press down firmly.
Repeat with another layer of sweet potato and parsnip.
Drizzle over a little olive oil and add a little cracked black pepper then place in the oven for 45 minutes.
To make the mushroom puree, melt the butter in a frying pan and add in the shallots and cook for a few minutes until softened then add in the mushrooms. Season with salt and pepper and cook until softened and any liquid has been absorbed.
Add in the white wine and all to evaporate before adding in the double cream. Cook until the mixture has thickened then place into a blender and blitz until smooth.
Return to the pan and keep warm until ready to serve.
Remove from the oven and carefully place onto a plate and remove the ring.
Surround with the mushroom purée.
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