The item really in question is neither Gefilte or Ptcha, its something else (Actually its Herring )
I have read the Meisels book that was quoted here (There are actually 2 related one, Shabbos Secrets and Food Secrets) and he seems to have ideas of the holiness of certain types of food and is opposed to eating other foods. He for example thinks one should eat Chulent at Melava Malka instead of the minhag Hamakon of Pizza (Because there is some “Holiness” of Chulent over Pizza)