Best Richardson Hole-in-the-Wall Restaurants in TX. The best Richardson Hole-in-the-Wall restaurants exemplify the city’s commitment to quality, flavor, and community. In this article, we will explore three standout establishments-The Wing’D Nut, Good Union Urban BBQ, and The Fifth: Fireside Patio and Bar-that showcase the very best of what Richardson has to offer. Richardson, TX, is a city with a rich and diverse food culture, home to numerous hidden culinary gems that offer unique and authentic dining experiences.