In a medium sauce pan, pour in the vegetable stock bring to a simmer and keep warm. Set aside.
In a large saucepan, melt 2 tablespoons of butter. Add the diced shallots and cook, stirring occasionally, until soft for about 3 minutes.
Add the rice and cook for 2 minutes, ensuring the rice is coated with butter. Add more butter if necessary.
Add the wine/vinegar/brandy and cook, stirring, until evaporated about 2 more minutes.
Add ½ cup of the warmed broth and stir until absorbed. Repeat, continuing to add the broth in ½ cup increments.
When all of the broth has been added and absorbed, add the remaining 2 Tablespoons of butter, Mascarpone, and heavy cream. Continue to stir the risotto for about one minute.
When the rice is al-dente, remove from heat and season with pepper and salt.