No rule for this one
No ending or word group predicts the article of Fleisch. Learn it as a pair and say it out loud: das Fleisch.
das Fleisch
It's das Fleisch. Fleisch is neuter.
Ist das Fleisch halal?
Is the meat halal?
No ending or word group predicts the article of Fleisch. Learn it as a pair and say it out loud: das Fleisch.