Rich, spiced birria broth served as a dipping sauce for tacos is liquid gold. This high protein, healthy broth is a fresh, warming accompaniment perfect for family taco nights.
Soak guajillo and ancho chiles in hot water for 15 minutes until softened; remove stems and seeds.
Bring 10 cups water to a boil in a large pot over medium-high heat. Add beef shank and short ribs; skim off foam as it rises for a clear broth.
Add onion (quartered), carrot (sliced), bay leaves, and whole garlic. Reduce heat to low, partially cover, and simmer for 1 hour.
Blend the soaked chiles with the tomato, cumin, oregano, peppercorns, and 1 cup broth until very smooth. Strain the mixture for a silky texture.
Add blended chile sauce to the pot, stir well, and continue simmering uncovered for another 2–2.5 hours until beef is fork-tender.
Stir in salt and apple cider vinegar; taste and adjust seasoning as needed while simmering for 15 more minutes.
Remove the beef and bay leaves. Strain the broth through a fine sieve for a clear consome.
Skim off any excess fat, return to medium heat, and serve the hot consome as a dipping sauce for tacos.