Place the cream, mascarpone and sugar in the bowl of a mixer and whip the cream until stiff and smooth.
Take 150 ml of the poaching pear juice and mix it with the sea buckthorn liqueur. You can omit the liqueur if you prefer not to drink alcohol.
Dip the long fingers into the pear liquid mixture and line the bottom of the dish with them. Spoon half of your mascarpone mixture on top.
Then arrange the poached pear in slices or cubes on top of the mascarpone. Sprinkle the spiced cookies on top and cover with the second half of your mascarpone mixture.
Leave to set in the fridge for at least 2-4 hours. Before serving, whip the extra whipped cream until stiff. Use this to decorate the top of the tiramisu and sprinkle with a few sprinkles and spiced cookies.