Char the poblanos under a broiler or over a gas flame until blistered. Place in a covered bowl for 10 minutes, then peel carefully and slit one side to remove the seeds.
Cook the Picadillo and Nogada:
Brown the pork in a skillet. Add the onion, garlic, tomatoes, apple, pear, peach, cinnamon, and a pinch of salt. Cook until thick and the fruit is tender, about 15 minutes.
Blend the walnuts, milk, cream cheese, and a pinch of salt until smooth. Chill until ready to serve.
Fill and Serve:
Fill each poblano with picadillo and arrange on a platter.
Spoon over the walnut sauce and garnish with pomegranate seeds and parsley. Serve at room temperature.
Notes
Peel walnuts for a smooth sauce.
Do not overfill the peppers.
Serve the sauce cool or at room temperature, not hot.