Five years ago, the Denver plant and one in California slaughtered lamb according to halal standards just one day a week, Ahart said. As demand rose, Superior Farms, which mostly handles lamb with some goat, became all-halal, all the time.
"It really got to be too cumbersome as time went by to maintain inventory segregation on the product that was halal versus the product that wasn't halal," he said.
Shane MacKenzie, who oversees Superior's operations and has worked with the company for 21 years, said halal slaughter doesn't slow anything down: "It's exactly the same except for the practicing Muslim [slaughterman]."
Every step in the company's process is approved by the federal Safe and Human Slaughter Act, which every slaughterhouse must follow, as well as a certifying board, Halal Transactions of Omaha. Additionally, the plant is required to prevent any contamination by non-halal foods, such as pork, alcohol or the use of antibiotics, since they tend to contain pork byproducts.
There isn't a single governing body overseeing the certification of halal meats, and the standards can vary, which means there's little data on the industry. But according to Nielsen, recent sales for halal foods in the U.S. reached $1.9 billion, and Thomson Reuters has pegged the global market at about $415 billion.
Despite the marketing opportunities, DinarStandard research analyst Haroon Latif said it's fairly common for retailers to avoid halal labels.
"They may feel it's not necessary to mention that it's halal and, in some cases, they may fear a backlash," according to Latif, whose company is a leader in researching the U.S. halal market.
In 2016, Thomson Reuters and DinarStandard analyzed more than 50,000 social media posts by people 18 to 35 that mentioned the word "halal." They found 18 percent of posts had Islamophobic themes and were more likely to come from Europe, Australia and the United States.
When it comes to serving halal, some retailers may be doing it, but don't trumpet that fact — at least in the United States. Customers pointed out on Twitter a few years ago that burger chain Shake Shack sources meat from known halal-certified supplier Creekstone Farms. But Shake Shack denied it on social media and its website says halal meat is only at its locations in the U.K. and Middle East.
So if Muslims can't look at a label, how do they know it's halal? Often, Latif said, they have to look at social media or websites that list certified halal manufacturers. But he thinks retailers eventually will put their fears aside as they see this market grow, treating halal like kosher, which is now mainstream.
"Once they do the back of the envelope calculations and they understand how many Muslim consumers they're living close to, they'll realize the huge benefit," he said.
As for Eganwa, the Muslim who has been performing halal slaughtering for about a year, he says he considers doing things according to his religious custom "a service to my people."
This story comes to us from Harvest Public Media, a reporting collaboration focused on food and agriculture. You Follow Esther Honig on Twitter: @estherhonig