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Bismillahirrahmnirraheem
There is nothing to be contradictory in Quran if you think so as in the other thread but as usual only full of wisdom calling people towards the deen of Allah SWT by His SWT mercy. The religion of Muhammad (SAW) is nothing but the religion of Ibrahim (AS). Those of jews and christians who believed in Ibrahim AS were asked to follow the religion of Muhammad (SAW) for it is the religion of Ibrahim (AS). Quran keeps inviting people of Book to Islam out of immense mercy of Allah SWT. As advised, people should go through the tafsir of Quran without trying to interpret on their own wittingly or unwittingly.
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Every (kind of) food was lawful for the children of Isra'il, except what Isra'il had made unlawful for himself well before the Torah was revealed. Say, 'Then, bring the Torah and recite it, if you are true!' [3:93]
Then, after all this, those who forge the lie and attribute it to Allah, they are the transgressors. [3:94] Say, "Allah has spoken the truth. So, follow the Faith of Ibrahim, the upright -- and he was not one of the associators!' [3:95]

Commentary
In the verses appearing above, there is a continuity of arguments against positions taken by the people of the Book. At some places, it concerns Jews and at others, the Christians. One such argument, which has been reported in Ruh al-Ma'ani on the authority of Wahidi and al-Kalbi, recounts the incident when the Holy Prophet SAW stated his adherence to the community of Abraham with reference to all fundamentals of the religious code, and most of the subsidiaries, the Jews objected by saying: 'You eat camel meat and partake of its milk although these were unlawful for Abraham.' The Holy Prophet SAW said: 'No, this was lawful for him.' The Jews said: 'All that we consider unlawful has continued to be unlawful since the days of Naoh and Abraham to the point that this unlawfulness reached us.' Thereupon, Allah
Almighty revealed the verse: 'Every (kind of) food was lawful for the children of Isra'il- 93' to refute the Jewish claim in which it is said that before the revelation of Torah, all things were lawful for the children of Isra'il except the camel meat which Isra'il (Jacob) AS himself had denied to eat for a particular reason, and then it remained unlawful for his progeny also.

The fact, as narrated by Sayyidna Ibn 'Abbas in an authentic report, is that Jacob suffered from Sciatica. He had taken a vow that he would abandon what he liked most in what he ate if Allah Almighty cured him of the disease. He was cured and camel meat was what he liked most, so he abandoned it. (See Al-Hakim and al-Tirmidhi as quoted by Ruh al-Ma'ani). Then, it so happened that this prohibition which started because of a vow continued among the Bani Isra'il as a divine injunction. It seems their code recognized a vow as a cause of unlawfulness of something lawful, like in our shariah, a vow may make the permissible acts as obligatory. However, a vow or a pledge which renders things unlawful is, in reality, an oath which is not permissible in our shariah. Infact in such a case, it is obligatory to break the truth and make amends by paying kaffarah. This is in accordance with what Allah SWT has said in the verse “..why do you forbid what Allah has made lawful for you?-66:1” (see al-Tafsir al kabir).
Maariful Quran, Volume 2, pp 116-117.
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