A huge explosion rocked suburban New Jersey Sunday morning -- but from an unexpected source.

Though the Christmas season still remains a few months away, New Jersey residents were showered with debris and eggnog when a vat where one of the ingredients for the seasonal beverage is made blew up in Totowa, New Jersey, according to the New York Daily News.

The blast happened at Pharmachem Laboratories where workers were "reportedly crafting a new recipe for the seasonal treat flavoring when it erupted," reports the Daily News.

"There was a big vat that had this product in it," Totowa Fire Marshal Allen Del Vecchio told ABC 7. "What we're trying to determine is what ignited this product that made the explosion."

According to the Star Ledger, two workers were injured in the incident and were transported to St. Joseph's Hospital in Paterson. Thankfully, the laboratory only operates with a minimal crew on the weekends, averting a larger disaster.

"People could have been killed -- normal operation, you'd have had five, ten people working in there - that's how violent the explosion was," Del Vecchio said. "The damage was in the millions."

Del Vecchio added that the explosion could be heard as far as three miles. He told the New Jersey newspaper that, based on the blast pattern, the explosion originated from "a furnace-like device known as a heat exchange unit."

"It wasn't a flammable material. It wasn't material that was under pressure," he said, referring to the ingredients. "So when you started eliminating things, it leads you back to that one probable source."

This cause, he said, could have been a hot air or gas pocket built up over time inside the vat, reports the Star Ledger. Though there was no fire, part of the building's wall was blown out and Del Vecchio said he believed the rest will have to be torn down.

According to its website, Pharmachem "is a family of companies specializing in the manufacture and supply of custom and branded nutritional ingredients, as well as process services. We serve the natural and nutritional, food and beverages, flavors and fragrances industries."