2) Stir in the shallots and garlic and saute 3 to 4 minutes longer. Add the corned beef and black pepper and cook until the beef is starting to crisp, about 10 minutes. Stir occasionally during this process.
3) Deglaze the pan with the white wine. Add in the cream, milk, the mustards and the horseradish. Simmer until the sauce has tightened up a bit, about 5 minutes. Stir in the shredded cheese and adjust seasonings, as needed.
4) Stir in the peas and the pasta, then transfer into a serving dish. Serve immediately garnished with the Parmesan.