For the sangria: bring the red wine, sugar, vanilla pod, orange and lemon slices, pepper, cinnamon and star anise to a boil for 5 minutes. Cover and set aside at room temperature for 1 hour
Trim, rinse and store the figs in a high rimmed container
Heat the sangria and pour over the fruit. Cover. Set aside for 48 hours in the fridge. Crush the walnuts
Filter the marinade and reduce it to ¾. Pour in the vinegar and heat for 2 minutes. Mix with the chopped walnuts
Cut the figs crosswise to a depth of ¾
Add the cold nut-reduction mixture to the centre of the fig
Cut slices of foie gras from the terrine and place them on a plate, accompanied by two stuffed figs per person