Sitting on the patio of his newest restaurant, on Dallas’s bamboo-lined Katy Trail, Stephan Courseau beams like a new father. The founder of Travis Street Hospitality—established after he brought “white-tablecloth stalwart” Le Bilboquet from New York more than a decade ago and followed it with two of his own restaurants, Knox Bistro and Georgie—Courseau explains the raison d’être for Le PasSage, an Asian-French concept that opened October 18. “I could have done ten Le Bilboquets,” he says in a still discernible French accent, despite his fifteen years in Dallas. As the sole holder of rights to expand the Parisian-style bistro in Texas, Courseau says he “probably wouldn’t have to work anymore” if he had stuck with the one-hit wonder. “But that’s boring.”Murmuring in a soft,…