Named after the Tijuana area code, 664 TJ Birrieria at 1092 Garnet Ave in the 92109 is a Mexican restaurant that specializes in Baja-style birria — slow-cooked, richly spiced shredded beef served with consomé dipping broth, cilantro, and onions. The chain first opened in National City in 2016 and has since expanded to eleven locations across San Diego County plus a Las Vegas outpost, but this Pacific Beach branch carved out its own identity on Garnet Avenue when it replaced the longtime Cotija's Taco Shop in 2022. Taco fans walking Garnet Ave can pair a visit here with a stop at Oscars Mexican Seafood for a coastal take on Mexican flavors, but the focused menu at 664 is what keeps regulars coming back: birria tacos on corn tortillas, quesabirria loaded with melted cheese, tostabirria, and a birria ramen fusion that layers tender beef and consomé broth over noodles for a dish that bridges two culinary traditions. Menudo rojo is available for those who want a traditional tripe-and-hominy soup, and the extras list includes nervio tacos featuring beef nerve that reviewers praise for their unusual texture. The operation runs lean — the cashier sometimes doubles as the cook — and the dining room is small, with some outdoor seating and a hand-washing station in lieu of public restrooms. Reviewers on Uber Eats and Google consistently highlight the generous portions relative to the price, and the meat's tenderness comes up in nearly every positive review. The restaurant holds a 4.5-star Google rating across more than 90 reviews and is open daily from 9 a.m. to 8 p.m. Cash transactions move faster here, as several reviewers advise, though cards are accepted. Visitors looking for a sit-down Mexican dinner with a broader menu can head west on Garnet toward Pueblo for mole dishes and margaritas in a full-service setting. The restaurant accepts credit cards, debit cards, and NFC payments alongside cash.