Seafood complicates the rules, though, as the FDA has authority over seafood. But not catfish – catfish actually falls under USDA regulation.
The agencies work differently. Before Zink runs a batch of beef burritos, he has to call a USDA inspector to be on-site while the food is prepared. A USDA official will stop by at other times during the year to check in. He doesn't hear from the FDA so often.
"FDA is a once-a-year thing," Zink says. "They pop in and do their inspection and they're gone."
A patchwork of more than a dozen federal agencies plays a part in keeping food from making Americans sick. Critics say the system has holes, and some think we would all be safer if food safety at the federal level were brought under one roof.
Altogether, 15 federal agencies play a role in food safety, from the EPA to the Centers for Disease Control. Food processors are subject to a dizzying array of regulations, spending time and money to prove their products are safe.
Each year, 1 in 6 Americans comes down with listeria, E. coli, salmonella or some other foodborne illness. According to the CDC, 3,000 people die annually. For years, critics have said a streamlined system would be safer. Even President Obama has called for the creation of a single food-safety agency in his 2016 budget.
Heartland Gourmet's Zink says after 25 years in the business, he has no trouble navigating the system. But there's no denying it's complex.
"And it ends up just being a gigantic mess in terms of a comprehensive approach to food safety," says Courtney Thomas, who studies political science and food safety at Virginia Tech University.
Thomas says the system looks fractured today because it was cobbled together from the start. The first food-safety laws, passed in 1906, put the USDA in charge of meat quality because the agency already worked with meatpackers. The FDA was created to ensure purity in other foods.
"Right out of the gate there were two different laws, two different legislative mandates that were given to two completely different agencies in the federal government," Thomas says. "And from there it only spiraled."
The U.S. Government Accountability Office has been a leading critic of the fragmented food-safety system, for years labeling it a high-risk area in need of reform. The GAO's Steve Morris says the food-safety system is one recall away from a crisis.
One longstanding issue is that the various agencies tend to keep a narrow focus and work on small slices of oversight.
"Right now, what you have is fairly limited coordination," Morris says. "So the consumer and the Congress basically lack this comprehensive picture of what the national strategy is."
That's a big problem, because there are challenges ahead that cut across all agencies. For instance, 16 percent of the food Americans eat is imported, and that number is rising. Steve Taylor, a food scientist at the University of Nebraska-Lincoln, says regulators are already behind in inspecting foreign food facilities.
"And if you got to the right people in a lot of big corporations in the United States involved in food processing, they'd say that's one of their biggest worries, too," Taylor says.
One agency could be more efficient checking-in on foreign suppliers.
But Virginia Tech's Thomas says the chances are pretty low that Washington will adopt a single food-safety agency any time soon.
The U.S. food system is currently one of the safest in the world, and some say federal time and money is better spent elsewhere. Most food companies would prefer a complicated but familiar system over an unknown overhaul. And with multiple agencies involved, more politicians have oversight of food safety, which they might not want to give that up.
"There's no easy fix to this problem," Thomas says. "What you're talking about is a legal, a regulatory, and a cultural shift. A political shift that we haven't seen in this country in the last 100 years."
And without an immediate crisis, it seems there's not much political appetite for shaking up the system.
Grant Gerlock reports from Lincoln, Neb., for NET News and Harvest Public Media, a public radio reporting collaboration that focuses on agriculture and food production issues.