Is there a process that can turn non halal food in to halal food such as praying or cleaning/cooking the food in a certain way?
No it can not.
Haram foods have been called filth (رجس) in 6:145 and 5:90 and their ritual impurity is of an inherent nature (نجس العين). Nothing can be done to them to purify them. And it is not permitted to derive any benefit from them unless it is explicitly proven to be permitted.
We know that the Prophet commanded people to throw away haram foods (for example see here , here and here) and if it was possible to make them halal by some ritual or process, then the Prophet would have commanded that instead since wastefulness is forbidden.
According to Hanafi school, if you completely burn najis substance it becomes non-najis after that complete chemical transformation, see e. g. excrements.
Non halal food cannot become halal. It is however allowed to consume non halal under starvation only but non halal will still remains non halal. Such consumption of non halal due to starvation will be forgiven by Allah as long as starvation is not self induced by laziness or day dreaming of big job.
Allah specified some food as haram.we can't eat food which is haram. Alcohol is haram. And some food which mentioned haram in hadith and Quran as haram we can't make it halal. Prophets diet is sunnah and You can watch this SUNNAH FOOD here ◆◆◆