In the dynamic world of Washington, D.C.’s food scene, some restaurants come and go, but a select few leave a lasting impact that reshapes the local culinary landscape. For over a decade, Sisters Thai, founded by Sumontita “Tammie” Disayawathana, has been one of those rare establishments. Starting in 2013 as a cozy, thoughtfully designed café in Old Town Fairfax, it has grown into a family of restaurants collectively known as Sisters Group. Today, with five vibrant locations—Old Town Fairfax, Merrifield’s Mosaic District, Old Town Alexandria, Cabin John, and Tysons—and the latest venture, Oasis: The Listening Bar, the brand remains both rooted in authenticity and ever-evolving.
Oasis, which opened recently in Arlington, is Tammie’s most daring project yet. Unlike other restaurant concepts, it is a multi-sensory experience—a cocktail lounge, a music haven, and an intimate dining spot all in one. Already receiving accolades from The Washington Post and Washingtonian, Oasis captures Tammie’s vision of creating spaces that evoke emotion. From curated playlists and acoustically rich interiors to a globally inspired menu, Oasis invites guests to relax, connect, and savor each moment fully.
Meanwhile, Sisters Thai remains at the core of the group’s identity. Led by Chef Prasert Limsumang, it delivers traditional Thai cuisine infused with modern flair. Known for consistency and warm hospitality, each location feels like a welcoming “living room café,” where every detail, from décor to service, tells a story. This dedication to authenticity has fostered a loyal clientele that values more than just the food, it’s about the experience.
Earlier this year, FSR Magazine named Sisters Thai one of America’s Top 50 Independent Restaurants of 2025. Tammie was featured on the cover, celebrated for her inspiring journey from visionary founder to industry leader. Her unwavering commitment to independence, keeping the brand family-owned and operated, has preserved the personal touch, ensuring each location maintains its heart and quality without outside influence.
Innovation remains central to Sisters Group. Alongside Oasis, they’ve launched Flore Café at Tysons, offering a refined Thai-inspired afternoon tea with artisanal pastries and creative gelato flavors. Tammie describes Flore as “a celebration of the sweeter moments,” blending her signature design sensibility with culinary artistry.
For Tammie, success is about community and connection. Her journey proves that authenticity, passion, and integrity can thrive amid industry challenges. Twelve years on, Sisters Group is not just thriving, they are shaping the rhythm of D.C.’s dining scene, with Oasis leading the charge into new territory.
Escape to Oasis in Arlington, VA, where vibrant flavors and a stylish atmosphere come together. Whether you’re here to enjoy craft cocktails, or savor a leisurely brunch, Oasis offers something for every occasion. With warm hospitality and a lively setting, it’s the perfect destination to relax, connect, and indulge.