Authentic Pho Bone Broth: A Slow-Simmered Recipe

Pho bone broth is the savory, aromatic base for Vietnamese beef pho, made by gently simmering beef bones with charred onion and ginger, warm spices, and fish sauce. This version builds a clear, deeply flavored broth without a hard boil; regional and family recipes vary, especially in sweetness and seasoning.

Ingredients

5 lb (2.3 kg) beef bones, ideally a mix of marrow bones and knuckle or joint bones, cut into manageable pieces
2 lb (900 g) beef brisket, optional, for tender meat to serve with the broth
6 qt (5.7 L) cold water, plus more if needed to keep the bones covered
2 large yellow onions, about 1 lb (450 g) total, halved
1 large piece fresh ginger, about 6 oz (170 g), split lengthwise
4 whole star anise pods
1 cinnamon stick, about 3 in (7.5 cm)
4 whole cloves
1 tsp (2 g) coriander seeds
1 tsp (2 g) fennel seeds
1 black cardamom pod, lightly cracked, optional
2 tbsp (30 g) rock sugar, or 1 tbsp (12 g) light brown sugar
3 tbsp (45 ml) fish sauce, plus more to taste
1 tbsp (15 g) fine salt, plus more to taste

Instructions

Blanch and rinse the bones. Put the bones in a large stockpot and cover with cold water. Bring to a boil over high heat and boil for 10 minutes; gray foam and residue will rise to the surface. Drain the bones, discard the blanching water, and rinse each piece under cool running water. Wash the pot to remove residue. This step helps keep the finished broth clean-tasting and clear.
Char the onion and ginger. While the bones blanch, heat a heavy skillet or cast-iron pan over medium-high heat. Put the onion halves and ginger cut-side down in the dry pan. Cook for about 8–10 minutes, turning as needed, until the cut surfaces are well browned and lightly blackened in spots. A grill or broiler also works; watch closely so the aromatics char rather than burn to ash. Set aside.
Start the broth. Return the rinsed bones to the clean pot and add 6 qt (5.7 L) fresh cold water. Bring just to a boil, then immediately lower the heat to maintain a gentle simmer. Skim foam from the surface during the first 30 minutes. Add the brisket, if using, and keep the liquid at a bare simmer: a few small bubbles should rise now and then, not a rolling boil.
Cook the brisket safely and until tender. Simmer the brisket in the broth, uncovered, until a food thermometer inserted into the thickest part reads at least 145°F (63°C), the USDA FSIS safe minimum for a whole cut of beef; let it rest for 3 minutes. For pho, brisket is often simmered longer until a fork slides in easily, usually about 2½–3½ hours depending on thickness. Remove it when tender, cover loosely, and refrigerate if it will not be sliced and served within 2 hours. Keep the bones simmering.
Add the aromatics and spices. Add the charred onion and ginger to the pot. Put the star anise, cinnamon, cloves, coriander, fennel, and optional black cardamom in a dry skillet. Toast over medium-low heat for 2–3 minutes, shaking the pan, until fragrant; avoid scorching them. Add the spices, sugar, salt, and fish sauce to the broth. Simmer gently for the remaining time. Keep the pot partly uncovered and skim excess fat or foam as needed.
Strain and season. After 8 hours of gentle simmering in total after the bones enter the fresh water, switch off the heat. Strain the broth through a fine-mesh strainer into a clean pot or heatproof containers; discard the bones, spices, and spent aromatics. Taste and add fish sauce or salt a little at a time. If the flavor is too concentrated, add hot water; if it seems mild, simmer the strained broth for a few minutes to reduce it. This straining and final adjustment take about 20 minutes, bringing total cooking time to 8 hours 30 minutes.
Prepare the brisket for bowls. Slice the rested, tender brisket thinly across the grain. If it has been refrigerated, warm the slices in the hot broth just before serving rather than boiling them, which can make the meat tough. The broth is now ready to ladle over noodles and other pho toppings.

Tips

Choose bones for both body and flavor. Knuckle, joint, and other collagen-rich bones give broth more body; marrow bones contribute richness. A mix is useful, but avoid filling the pot with marrow bones alone, which can make the broth feel greasy. Ask a butcher to cut large bones into pieces that fit your pot.
Keep the simmer gentle. A vigorous boil breaks up fat and particles, producing a cloudy, greasy broth. If the surface is churning, lower the heat. Skim early in cooking, but there is no need to remove every small bead of fat.
Adjust seasoning at the end. Fish sauce varies in saltiness, and simmering concentrates the broth. Start with the listed amount, taste after straining, then add more in small increments. If fish sauce is unavailable, use light soy sauce as a practical substitute; it brings salt and savoriness but changes the broth’s flavor and is not a traditional equivalent.
Use a spice sachet if you prefer. Tie the spices in cheesecloth or put them in a reusable spice bag before adding them. It makes straining easier and helps prevent a stray clove or seed from dominating a serving.

Serving Suggestions

For bowls of pho, cook flat rice noodles according to their package directions and divide them among warmed bowls. Add thin slices of cooked brisket, then pour very hot broth over the noodles and meat. Traditionally, bowls may also include thin raw beef that cooks in the hot broth; use fresh beef from a reliable source, slice it very thinly, keep it cold until serving, and make sure the broth is piping hot. Do not use this method for ground beef or meat that has been sitting at room temperature.

Set out sliced scallions, cilantro, Thai basil, lime wedges, and thinly sliced chile so each person can add them to taste. Bean sprouts, hoisin sauce, and chile sauce are common accompaniments in many restaurants and homes, though toppings and condiments vary by region and preference. Keep the broth’s balance in mind: taste it before adding salty sauces, and use lime to brighten a bowl rather than to correct an under-seasoned pot.

Variations

Make a bones-only broth. Leave out the brisket if you want broth for later pho or another soup. The finished broth will be less meaty, so taste and season it carefully after straining. You can cook sliced beef separately when assembling bowls.

Shift the spice balance. For a more restrained, northern-style profile, use a little less sugar and keep the spice notes subtle. For a sweeter, more aromatic bowl, add a small amount of sugar or an extra piece of star anise, but avoid adding a large handful of spices: too much can make a long-simmered broth taste medicinal. There is no single seasoning balance used in every Vietnamese household.

Substitute difficult-to-find spices thoughtfully. Black cardamom, which has a smoky aroma, can be omitted if unavailable; green cardamom is not an exact replacement and gives a brighter, floral note. Rock sugar dissolves cleanly, but light brown sugar works in a smaller quantity and adds a faint molasses flavor. Do not replace the whole spices with ground spice blends, which are harder to strain and can cloud the broth.

Make a lighter broth. After chilling, lift off the solidified fat before reheating. This reduces surface richness while leaving the broth’s seasoning intact. For a fuller finish, leave some fat in place or stir a spoonful back into the pot.

Storage and Reheating

Cool the broth promptly in shallow containers, or set the pot in an ice-water bath and stir with a clean utensil to help it cool. Refrigerate within 2 hours of cooking. Keep broth in covered containers in the refrigerator for 3–4 days. Store sliced brisket separately in a covered container and use it within the same period.

For longer storage, freeze the cooled broth in meal-size containers, leaving a little room for expansion. It keeps its best quality for about 3 months; thaw it overnight in the refrigerator or reheat it from frozen over low heat. Reheat broth and any cooked meat to 165°F (74°C), checking with a food thermometer. Bring the broth to a gentle simmer after it reaches that temperature, then assemble bowls. Avoid repeatedly cooling and reheating the whole batch; warm only what you plan to serve.

Frequently Asked Questions

Why blanch the bones before making pho broth?
Blanching loosens blood and surface residue that would otherwise make the broth murky or give it an off flavor. Discard that first water and rinse both the bones and pot before starting the actual broth. It is a short step that improves clarity without removing the bones’ deeper flavor.

Can I make pho broth in a slow cooker?
Yes, if your slow cooker can safely hold the bones and water without exceeding its fill line. Blanch and rinse the bones, char the aromatics, and toast the spices as directed, then transfer everything to the cooker. Follow the appliance instructions and maintain a safe simmer; cooking time varies by model, so judge the broth by its flavor and body rather than assuming every cooker runs at the same temperature.

Why did my broth turn cloudy?
The most common cause is a hard boil, which emulsifies fat and tiny particles into the liquid. A gentle simmer and careful early skimming help. Cloudiness does not mean the broth is unusable; strain it well and serve it as usual, though it may not have the clear appearance often associated with pho.

Can I leave out fish sauce?
Yes. The broth will lack some of the salty, savory depth fish sauce contributes. Season with salt and, if suitable for your diet, a little light soy sauce instead, then taste gradually. Check the label if avoiding fish or wheat, since ingredients and processing can differ between products.

Do I have to include brisket?
No. Brisket is optional and is included here so you can get both broth and sliced beef for bowls from one pot. Use bones alone for a stock-style base, or prepare another beef topping separately. If cooking brisket in the broth, remove it when tender rather than leaving it in for the entire long simmer.

Can I prepare the broth ahead?
Yes. Make and strain it a day or two before serving, refrigerate it promptly, and lift off any solidified fat if desired. Reheat the amount needed to 165°F (74°C), then assemble bowls with freshly cooked noodles and toppings. Freeze extra broth in smaller portions so it is easy to thaw only what you need.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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