Many food manufacturers don't manufacture Halal food, just because either they are hesitant or they don't know what is Halal.
So what is halal(permitted) food:
According to Islamic scriptures, All plant based food, all sea food(exception exists among some schools of thought) and grazing animals(if properly slaughtered according to Islamic method, except for Pig) are considered Halal. Similarly Chicken meat, if properly slaughtered and eggs are also Halal.
The difference of Halal and Haram: Very thin, as far as industrial manufacturing goes.
For example, Lecithin, and emulsifier, is used widely in food industry. This compound can be derived from both Halal(conveniently Plant oils) and Haram(Animal ) sources. Another such compound is glycerin. This compound can also be manufactured both from the Halal and Haram sources.
The trillion dollar Question is: Why most of food manufacturers don't take care of these small things to get their share from the Islamic world's market? Currently some big manufacturers, like Nestle, take care of these small things, and are earning a lot of money from muslim world, almost without any competition.
Note: A product can be labeled Halal, with very few small things taken cared of. So, guys lets put your fears aside, and lets tape an almost untapped market.
@BHarwana @Mentee