Grind the walnuts and 3/4 cup bread crumbs in a food processor. Grind in half the pomegranate seeds and the bell pepper, pomegranate juice, lemon juice, pepper flakes, cumin, salt, and pepper. The mixture should be the consistency of soft ice cream; add bread crumbs as necessary. Correct the seasoning, adding salt, cumin, or lemon juice: The pâté should be highly seasoned.