Ruling on cooking chicken on which there is any trace of blood
Question

                What is the ruling if, when cooking, I find some blood on chicken or lamb? Do we have to deal with it by cooking it, or should we stop cooking it and throw it away, or try to remove the blood from the pot? Please advise us in the light of Islamic teaching.
Praise be to Allah.
      The presence of some blood on chicken or other meat when cooking it does 
      not matter, because blood that is shed or poured forth is that which flows 
      from it at the time of slaughter, and it is this blood that is haraam. As 
      for that which remains in its veins after slaughter and comes out when it 
      is cut up or cooked, this is not blood that was shed or poured forth, and 
      it is something that Allah overlooks. 

    Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) said: 

    Eating grilled meat and steaks is permissible whether the meat was washed or 
    not; rather washing the meat of the animal that has been slaughtered in the 
    prescribed manner is an innovation. The Sahaabah (may Allah be pleased with 
    them) at the time of the Prophet (blessings and peace of Allah be upon him) 
    would take the meat and cook it and eat it without washing it, and they 
    would see the streaks of blood in the vessel. That is because Allah only 
    prohibited to them blood that is shed or poured forth. As for that which 
    remains in the veins, He did not prohibit it; rather He prohibited them to 
    seek it out in the veins as the Jews do. End quote. 

    Majmoo‘ al-Fataawa 
    (21/522) 
He 
    also said: 
It 
    is only the blood that is shed or poured forth that is prohibited. 
It 
    is proven that the Companions of the Messenger of Allah (blessings and peace 
    of Allah be upon him) used to put the meat in the vessel and streaks of 
    blood would be seen in the water, but I do not know of anyone among the 
    scholars who differed with the view that this is overlooked and is not 
    regarded as impure, according to scholarly consensus. End quote. 

    And Allah knows best.