CALDO DE COSTILLA (COLOMBIAN BEEF RIB SOUP)

Caldo de Costilla (Colombian Beef Rib Soup) image

Provided by J. Kenji López-Alt

Yield 4 servings

Number Of Ingredients 8

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1 bunch cilantro, leaves and fine stems
8 scallions
1 yellow onion, skin removed, halved pole to pole
5 to 6 medium cloves garlic, lightly smashed
1 teaspoon whole cumin seeds
3 to 4 pounds beef short ribs, oxtail or beef shins
Salt
1 pound firm, nonstarchy potatoes, such as red bliss or Yukon Gold

Steps:

Reserve a small handful of cilantro and 5 scallions. To a large stockpot or Dutch oven, add the split onion, the garlic cloves, the cumin seeds and the beef. Cover with water by 2 inches (3 to 4 quarts total).
Bring to a simmer over high heat, then reduce heat to maintain a very bare simmer. Using a ladle, skim off and discard any solid scum that has collected on the surface. Roughly chop the remaining cilantro and scallions, and add them to the pot. Cover and cook until the beef is tender and a skewer or knife shows no resistance when poked through the meat, 2½ to 3 hours.
Using tongs or a skimmer, remove the meat with the bones to a large plate and set aside.
Set a fine mesh strainer in a large bowl and strain the broth. Discard the solids. Scrub out the pot, then return the broth to it and season to taste with salt. (It should taste quite salty.) Proceed immediately to the next step, or return the beef to the broth and refrigerate in sealed containers for up to a week before continuing (or adapting into one of the alternate serving methods, see Note).
Peel the potatoes, halve or quarter them lengthwise, then cut crosswise into ⅓- to ½-inch-thick slices and add them to the broth. Simmer the potato slices in the broth until tender, 10 to 12 minutes. Return the beef to the broth.
Roughly chop the reserved cilantro and scallions, and add to the broth. Serve immediately.