- 1 15- to 16-ounce container whole-milk ricotta cheese or 15 ounces fresh whole-milk ricotta cheese
- 1 small leek (white and pale green parts only), halved lengthwise, thinly sliced crosswise
- 1 large egg
- 1/2 cup freshly grated Parmesan cheese, plus additional for serving
- 1 teaspoon salt
- 1/4 teaspoon ground black pepper
- 1/8 teaspoon ground nutmeg
- 2/3 cup all purpose flour, plus additional for dredging
- 1 cup shelled fresh fava beans or frozen double-peeled, thawed
- 1/2 cup (1 stick) butter
- 12 fresh sage leaves
- Set large strainer lined with double-layer damp cheesecloth over large bowl. Place ricotta in prepared strainer; cover with plastic and refrigerate overnight. (If using fresh ricotta, skip this step.)
- Cook leek in small pot of boiling salted water until tender, about 7 minutes. Drain. Rinse under cold water; drain. Using hands, squeeze leek dry.
- Mix ricotta, leek, egg, 1/2 cup Parmesan, salt, pepper, and nutmeg in bowl. Stir in 2/3 cup flour. Cover and chill mixture at least 1 hour and up to 1 day. Line rimmed baking sheet with parchment paper. Place flour for dredging in flat bowl. For each gnocchi, shape 1 tablespoon ricotta mixtureinto ball, then drop into bowl of flour, tossing to coat. Transfer gnocchi to baking sheet. (Can be made 4 hours ahead. Cover with plastic wrap; chill.)
- If using fresh fava beans, blanch in small saucepan of boiling salted water for 2 minutes; transfer to bowl of ice water. Peel beans.
- Melt butter in large nonstick skillet over medium heat. Add fava beans and sage leaves. Sauté until butter browns, favas are tender, and sage leaves are crisp, about 5 minutes. Set aside.
- Bring large pot of salted water to boil. Working in 2 batches, add gnocchi and cook until tender and cooked through, about 5 minutes. Using slotted spoon, transfer to skillet with fava beans; toss to coat. When all gnocchi have been added to skillet, toss over medium heat to warm. Serve with Parmesan.