Mastro’s, 1650 West Loop South, is the first restaurant in Texas and one of only a few U.S. dining rooms to serve the prized Japanese beef, according to the restaurant.

But Fertitta’s Mastro’s Steakhouse is offering a menu item not available at any of his restaurants: a nearly four-pound A5 Japanese wagyu long bone-in ribeye sourced from the Kagoshima region ...