How to Make It
Cook pasta according to package directions, omitting salt and fat. Drain pasta over a bowl; reserve 3/4 cup plus 2 tablespoons cooking liquid.
Place 6 tablespoons cooking liquid, lemon rind, juice, cream, and ricotta in a blender; process until smooth.
Heat a large skillet over medium heat. Add ricotta mixture to pan; cook 1 minute or until thoroughly heated. Add pasta, chives, salt, and pepper. Add remaining 1/2 cup cooking liquid as needed to make mixture creamy. Remove from heat; stir in grated Parmigiano-Reggiano cheese.
Lincoln Restaurant, Portland, Oregon