In 2017, the Macks entered into a partnership with the Utah restaurant development company Four Foods Group to standardize their business operations and grow the brand nationally. (Four Foods says it holds a 50.1 percent stake in the chain.)

Andrew and Shauna Smith, the group’s founders, said they were impressed by the economics of the restaurant. “You get so much food for your money, but the food cost is lower than average in the industry,” Mr. Smith said. There are also not many Hawaiian restaurants in Utah to compete with Mo’ Bettahs.

The plan is to open six more Utah locations starting this summer, with a branch in Idaho — which also has a large Mormon population — to follow next year. After that, Mo’ Bettahs plans to expand to states like Nevada and Missouri, in cities where housing costs are low and incomes are high.

Four Foods has gotten Mo’ Bettahs onto Instagram and Twitter, and expanded its presence on Facebook, which the Mack brothers had all but stopped using once they realized their fellow Mormons provided a much more powerful social platform.

“We’ve got this network of people from all over the world just because of the connectivity of the church,” Kimo said. “They have become our customers, our business partners, our insurance guys, our graphic design team.”

It helps that the teriyaki steak inspires devotion, too.

“This food is the next big thing,” said Mr. Vernon. “It’s going to be better than Chipotle and Panda Express.”

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