Is is permissible to drink chocolate liquor?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah and that Muhammad, sallallaahu ʻalayhi wa sallam, is His slave and Messenger. 

There is no harm in consuming this drink unless it contains alcohol or is proven to be harmful to one's health. The basic principle is that all kinds of food and beverages are lawful unless proven unlawful with sharee'ah evidence, according to the scholarly consensus. Hence, it is permissible to consume all kinds of food and beverages except for what is detrimental to one's health or what contains impure ingredients. In his book Az-Zaad, Al-Hajjaawi said in the chapter about food, “The basic principle is that all kinds of food are lawful as long as they are ritually pure and do not cause harm.”

Shaykh Ibn ʻUthaymeen wrote:

“In principle, all kinds of food are lawful according to the scholarly consensus; based on the verse: {It is He Who created for you all of that which is on the earth...} [Quran 2:29] ... Whoever claims otherwise, his view is outweighed by this evidence unless he can bring forth supportive evidence to substantiate his claim. Therefore, Allaah reproached those who declare unlawful what He deemed lawful: Allaah, The Exalted, says (what means): {Say: Who has forbidden the adornment of Allaah which He has produced for His servants and the good (lawful) things of provision?} [Quran 7:32]”

Allaah knows best.