999 Quan Vietnamese Street Food in College Area brings southern Vietnamese noodle soups to 5237 El Cajon Blvd, San Diego, CA 92115. The kitchen anchors its lineup around bun rieu, a crab-tomato broth ladled over rice vermicelli with fried tofu, and bun suon bo vien, a black-pepper-heavy beef rib soup built on slow-simmered bone stock with bo vien meatballs and fall-off-the-bone short ribs. El Cajon Boulevard through College Area runs one of the city's densest Vietnamese dining corridors, and 999 Quan adds bun bo hue — the spicy, lemongrass-laced Hue-style beef noodle soup — to a stretch already anchored by Pho Minh and its classic pho tai and pho dac biet bowls. That rib cut in the bun suon bo vien is the signature draw: each piece receives a long braise until the collagen breaks down, producing a tenderness uncommon in San Diego pho houses at this price point. The restaurant identifies as Asian-owned and stocks its prep line from the adjacent World Foods Supermarket, a full-service Asian grocery carrying the fresh ngo gai, Thai basil, and bean sprouts the kitchen plates alongside every bowl. Banh khot, crispy turmeric-coconut mini pancakes filled with shrimp, rounds out the menu when available, giving the lineup a Central Vietnam street-food range that most single-concept noodle shops skip. Three blocks east of SDSU on the same boulevard, the shop draws a split crowd of campus staff searching for food near SDSU and Vietnamese-food regulars crossing into College Area from City Heights. A single-origin pour-over at Ultreya Coffee and Tea a few blocks east keeps the corridor's afternoon foot traffic cycling through the same 92115 stretch. Each bowl ships with a full herb plate of cilantro, ngo gai, raw onion, lime, and bird's-eye chili, and the bun suon bo vien broth carries visible fat droplets that emulsify with a squeeze of lime into a body closer to Saigon street-stall output than the cleaner, sweeter broths common across most San Diego noodle counters.