Using wine to cook haraam meat
Question

                Some restaurants marinate meat in alcohol or wine before cooking, then they cook it after that. They do that so that the meat will be softer and tastier. What is the ruling on eating that?.
Praise be to Allah.The fact that alcohol is 
    forbidden in Islam is a well established fact and no Muslim has any excuse 
    for not knowing it. It is one of the major sins that doom a person to Hell. 
    This prohibition is mentioned in the Holy Book, where Allaah, may He be 
    glorified and exalted, says (interpretation of the meaning): 
“O you who believe! 
    Intoxicants (all kinds of alcoholic drinks), and gambling, and Al‑Ansaab 
    (stone altars for sacrifices to idols etc), and Al‑Azlaam (arrows for 
    seeking luck or decision) are an abomination of Shaytaan’s (Satan’s) 
    handiwork. So avoid (strictly all) that (abomination) in order that you may 
    be successful”
[al-Maa’idah 5:90]
    
This prohibition is general 
    and applies to all manners of using alcohol, whether in food or in drink. It 
    is not permissible to use it in food or drink in any way whatsoever. 
It says in al-Mawsoo’ah 
    al-Fqhiyyah (25/95): 
The one who cooks meat with 
    alcohol and consumes the juice is to be subjected to the hadd punishment, 
    because the essence of the alcohol is still present. The same applies to 
    making dough with it and eating it. This was stated by the Shaafa’is and 
    Hanbalis. End quote. 
Al-Sarkhasi said in 
    al-Mabsoot (24/25), which is a Hanafi book: 
If he makes dough with 
    flour and alcohol, then bakes it, it is makrooh (i.e., haraam) to eat it, 
    because the flour becomes impure from the alcohol and the impure dough 
    cannot be purified by baking, so it is not permissible to eat it. end 
    quote. 
He also said (24/32): 
If he puts alcohol in the 
    sauce then cooks it, it is not permissible to eat it. This action is not 
    permissible because it is using alcohol like vinegar, and we have explained 
    that this is not allowed. End quote. 
This is very similar to 
    what is mentioned in the question, that alcohol is being used like vinegar. 
So it is not permissible to 
    marinade meat in alcohol or to soak it in it, and it is not permissible to 
    cook with it at all. In that which is permissible there is sufficient and we 
    have no need of that which is forbidden. The Muslim is enjoined to avoid 
    alcohol completely, so we should boycott restaurants that use alcohol as an 
    ingredient in their food and in preparing and cooking food, rather we should 
    advise them and exhort them and warn people against them. 
And Allaah knows best.