Place red wine, brown sugar, whole cloves, cinnamon sticks, and allspice in a medium-sized saucepan, large enough to fit the pears. Bring to a simmer and stir until sugar is dissolved.
Once the wine mixture is simmering, wash and peel pears. Place in saucepan with wine mixture.
Decrease heat to medium and poach for 20-30 minutes or until soft, turning frequently to stew evenly on all sides.
Once cooked, remove from heat and allow the pears cool down in liquid mixture. You can transfer to a refrigerator to speed up the process.
To make the mascarpone cream, place heavy cream in a medium-sized bowl and whisk (using a handheld electric whisk) until stiff peaks form. Whisk in mascarpone cheese until just combined.
Before serving, simmer the remaining liquid in a small saucepan until slightly thickened. Remove cinnamon sticks before serving.
Serve cooled stewed pears with red wine syrup, mascarpone cream, crushed walnuts, and a dusting of ground cinnamon.