Bring a large pot of water to a boil; salt water, and add orzo. Cook orzo according to package directions until al dente; drain, and set aside. Melt butter in a medium saucepan over medium heat. Add shallot and lemon zest, and saute until translucent.
Add peas, and cook until bright green and tender, adding a little water if shallots brown before peas are tender.
Add cooked orzo, season with salt and pepper, and toss to combine. Remove from heat, and stir in mint. Serve immediately.