Heat 1 gallon of water to a low simmer
Whisk in ½ cup Beef Base until fully dissolved.
Stir in: chili crisp, soy sauce, and lime juice
Adjust balance: add chili crisp for heat, soy for umami, and lime for brightness
Cook noodles until just shy of fully tender (they soften slightly in hot broth)
Rinse quickly to stop cooking, then toss lightly with oil to prevent clumping
Spoon noodles in bowl, top with broth and garnish with red onion, cilantro and sesame seeds