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Answer: Your question touches on several halachic issues, which we will mention only in passing as necessary background for the answer to your question.
As you know, meat must have its blood removed before it can be eaten. Not everyone is aware that the main halachic problem relates to blood that moved from its initial position (Kritot 21b; Beit Yosef, Yoreh Deah 67). Salting, following the regular process, which includes rinsing the meat, is usually sufficient to remove the blood (YD 69). However, due to the high concentration of blood in liver, salting is insufficient and the more powerful process of broiling is required, after slitting the meat to allow blood to flow out more easily (Shulchan Aruch, YD 73:1). (There are important halachot regarding this process that we assume you know or will learn).
One of the situations that makes it more difficult to remove blood from any meat is if it sat 72 hours in between the shechita and the salting (Shulchan Aruch, YD 69:12). The situation can be remedied only by removing the blood through broiling (ibid.). The classical poskim were unsure to what extent broiling is fully effective in that case. The Shulchan Aruch (ibid.) takes a middle approach. On the one hand, he is concerned that the broiling did not remove all the blood, so that if one cooked (or fried or sautéed) the meat afterward, some blood could come out and render the meat not kosher. Therefore, one should not cook such meat even after broiling. On the other hand, since it is not certain that further blood will be displaced in the process, if he did cook such meat after broiling, it is permissible to eat it.
Decades ago, there was a major halachic dispute regarding the aforementioned 72 hours. Important poskim (including Aruch Hashulchan, YD 69:79, Yabia Omer II, YD 4) reason that if one froze the meat solid (basar kafoo), so that chemical processes are suspended, the "72-hour clock" stops. Others argue that freezing cannot change the halacha. (Nowadays the salting process is almost always done at the slaughtering facility soon after the shechita.) If one takes the lenient approach there, then the liver as well, assuming (on technical grounds, a safe assumption) it was frozen well within 72 hours, the broiling should work as it normally does.
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The same approach of relative leniency regarding liver that is to be broiled as compared to meat that is to be salted will help answer your question as well. It is quite a stringency to keep the 72 hour clock ticking when meat is frozen. Therefore, it is certainly halachically safe to use liver freely after broiling after it was frozen for 72 hours (see HaKashrut (Fuchs) 9:(263)). It is also permitted to l’chatchila allow this situation of freezing the liver with this intention, as Rav Ovadia Yosef (Yechaveh Da’at VI:46) explains cogently.
There is a difference of opinion among poskim whether one must wait for the liver to thaw before broiling (so that the beginning of the process not be considered cooking the liver in liquid as it thaws) or whether broiling is effective in any case (see HaKashrut 9:87).
Kuzari -Rabbi Ari Shvat Kuzari class 8- "Answering Questions on the Kuzari's Proof from Mass Revelation
Rabbis in Midrash
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Kuzari -Rabbi Ari Shvat Kuzari class 9 - "Seeing is Believing" (parag. 21-30)
These paragraphs elaborate on the theme that seeing and knowing is better than any attempt to prove logically, and begins explaining the difference between Israel and gentiles.
Ein Aya Various Universal Stages of the Geula Process
Rav Kook examines the various stages of redemption, explaining how (in addition to the obvious oft-mentioned stages of ingathering the exiles, reviving the Hebrew language, army, state etc.) the messianic dream of world prosperity, the State of Israel and world unity can and are realistically and logically gradually coming true.
Kuzari -Rabbi Ari Shvat Kuzari class 8- "Answering Questions on the Kuzari's Proof from Mass Revelation
How do we know that the "claim" of mass revelation to 2,000,000 witnesses at Mt. Sinai is really true? This important class answers all of the questions skeptics ask about this claim of the Kuzari.
Ein Aya Armies Still Necessary for Balance & the War Against Wars
Rav Kook explains why the world was originally divided into the various seemingly contradicting ideologies and cultures, in order to develop each one respectively. Swords or armies symbolize how each respective ideology defends themselves, as well as deters their opposing ideologies and cultures. On the other hand, the messianic era will be one of peace, and Rav Kook explains the transition to that stage, which mankind is already undergoing.
The Land of Israel LGBT'S IN ISRAEL
The question was asked, how can one make Aliyah with the LGBT parades?
Kuzari -Rabbi Ari Shvat Kuzari class 7 - Five Accumulative Proofs of G-d
As a preparation for the Kuzari's classic proof of G-d from the mass-revelation at Sinai, we start here with 5 other directions to strengthen our belief which also contribute to what the Kuzari will present as well.
Ein Aya Muscle & Meaning: The Dual Nature of Gevurah (Physical Strength)
Is physical strength and fitness a necessity or an ideal? Although it if often totally overlooked among topics of Judaism, Rav Kook writes that it clearly is also a necessity to deter the many enemies of Israel, but even in Y'mot HaMashiach, in the Messianic era, to a certain extent, it's ideal continues even after our enemies will have been finished off.
