Taiwanese Beef Noodle Soup

Preparation Bring water, soy sauce, rice wine, brown sugar, ginger, white parts of scallion, garlic, cilantro stems, tangerine peel, star anise, and red pepper flakes to a boil in a 5- to 6-quart pot, then reduce heat and simmer, uncovered, 10 minutes. Add short ribs and gently simmer, covered, turning occasionally, until meat is very tender but not falling apart, 2 1/4 to 2 1/2 hours. Let meat stand in cooking liquid, uncovered, 1 hour. Transfer meat to a cutting board with tongs and discard bones and membranes, then cut meat across the grain into 1/2-inch-thick slices. 3Pour beef broth through a cheesecloth-lined sieve into a bowl and discard solids. Skim fat from cooking liquid and transfer liquid to a 3-quart saucepan. Add chicken broth and meat and reheat soup over moderately low heat. Meanwhile, cook noodles in a 6- to 8-quart pot of (unsalted) boiling water until tender, about 7 minutes (14 to 15 minutes for linguine). Drain noodles well in a colander and divide among 4 large soup bowls. Ladle broth over noodles and top with meat, scallion greens, bean sprouts, pickled mustard greens, cilantro sprigs, and red chile (if using). *Available at some Asian markets. **Available at some Asian markets and Uwajimaya (800-889-1928). Cooks' note:Meat and beef broth can be cooked and strained 3 days ahead. Cool completely, uncovered, then chill meat in broth, covered. Skim fat before adding chicken broth.

Preparation Bring water, soy sauce, rice wine, brown sugar, ginger, white parts of scallion, garlic, cilantro stems, tangerine peel, star anise, and red pepper flakes to a boil in a 5- to 6-quart pot, then reduce heat and simmer, uncovered, 10 minutes. Add short ribs and gently simmer, covered, turning occasionally, until meat is very tender but not falling apart, 2 1/4 to 2 1/2 hours. Let meat stand in cooking liquid, uncovered, 1 hour. Transfer meat to a cutting board with tongs and discard bones and membranes, then cut meat across the grain into 1/2-inch-thick slices. 3Pour beef broth through a cheesecloth-lined sieve into a bowl and discard solids. Skim fat from cooking liquid and transfer liquid to a 3-quart saucepan. Add chicken broth and meat and reheat soup over moderately low heat. Meanwhile, cook noodles in a 6- to 8-quart pot of (unsalted) boiling water until tender, about 7 minutes (14 to 15 minutes for linguine). Drain noodles well in a colander and divide among 4 large soup bowls. Ladle broth over noodles and top with meat, scallion greens, bean sprouts, pickled mustard greens, cilantro sprigs, and red chile (if using). *Available at some Asian markets. **Available at some Asian markets and Uwajimaya (800-889-1928). Cooks' note:Meat and beef broth can be cooked and strained 3 days ahead. Cool completely, uncovered, then chill meat in broth, covered. Skim fat before adding chicken broth.