Combine all of the ingredients for the pea puree in a food processor or blender and process until smooth. Set aside.
Pour the stock into a small saucepan and bring to a simmer over low heat.
Melt the butter in a large saucepan or dutch oven over medium heat. Add the shallots and garlic and cook until softened, 3-4 minutes.
Add the rice and cook for 2 minutes, stirring occasionally.
Add the wine and cook, stirring, until the wine is absorbed.
Add about ½ cup of warm stock at a time and stir until fully absorbed. Repeat the process, until almost all of the liquid is added and absorbed (will take about 20 mins).
Taste the rice to see if it's done. If needed, add additional broth and cook for a bit longer. It should have a bite to it, but be creamy in texture. Stir in the pea puree.
Next, stir in the parmesan, mascarpone, prosciutto, lemon zest, lemon juice and mint until incorporated. Season to taste with salt and pepper.
Fold in the peas and serve in shallow bowls topped with additional parmesan and mint, if desired.