Bone Marrow Broth Recipe in a Slow Cooker, Step by Step

Bone marrow broth is a savory, gelatin-rich beef broth made by slowly simmering marrow and joint bones with vegetables and aromatics. Roasting the bones first builds a deeper flavor, while a slow cooker keeps the long, gentle cooking easy to manage.

Ingredients

4 lb (1.8 kg) beef bones, ideally 2½ lb (1.1 kg) marrow bones and 1½ lb (680 g) knuckle or joint bones
12 cups (2.8 L) cold water, or enough to cover the bones while staying below your slow cooker’s maximum-fill line
1 medium yellow onion, quartered, about 150 g
1 medium carrot, cut into large pieces, about 75 g
1 celery stalk, cut into large pieces, about 50 g
2 garlic cloves, lightly crushed, about 6 g
2 tablespoons (30 ml) apple cider vinegar
1 teaspoon (2 g) whole black peppercorns
2 dried bay leaves, about 0.5 g
4 parsley stems, about 5 g, optional
½ teaspoon (3 g) fine salt, optional; add more to taste after cooking

Instructions

Prepare the bones. Thaw frozen bones completely in the refrigerator before starting. Heat the oven to 425°F (220°C). Arrange the bones in a single layer in a roasting pan or on a rimmed baking sheet. Roast for 35 minutes, turning once halfway through, until browned. Roasting is for flavor; it is not necessary to cook the bones through before they go into the slow cooker.
Set up the slow cooker. Transfer the browned bones to a slow cooker with a capacity of at least 6 quarts (5.7 L). Add the onion, carrot, celery, garlic, vinegar, peppercorns, bay leaves, and parsley stems, if using. The vinegar adds a mild tang and helps balance the rich marrow flavor; it does not need to be increased to make the broth set.
Add the water. Pour in 12 cups (2.8 L) cold water, or enough to cover the bones without exceeding the cooker’s fill line. Some bones may float slightly, which is fine. Avoid packing the pot so tightly that water cannot circulate around them. Do not add more water than the cooker can safely hold.
Heat, then cook low and slow. Cover and cook on High for 1 hour, then switch to Low and cook for 11 hours, keeping the lid on. The liquid should stay hot with a very gentle movement rather than a vigorous boil. Slow cookers vary, so check the appliance instructions and avoid lifting the lid repeatedly; each opening lets heat escape and extends the cooking time.
Check the broth. After 12 hours of slow-cooker time, the liquid should be deeply colored and smell savory. The bones will look spent, and the marrow will be softened or mostly dissolved into the broth. If the broth is still thin in flavor, continue cooking on Low for up to 2 more hours. This extra time is optional and will make the total cooking time longer.
Strain carefully. Turn off the cooker. Use tongs to lift out the large bones and vegetables, then pour the broth through a fine-mesh strainer into a heatproof pot or bowl. Handle the liquid carefully: it is very hot, and a large slow-cooker insert can be heavy. Discard the strained solids, or pick any remaining usable meat from the bones for another dish.
Season and use. Stir in the optional ½ teaspoon (3 g) salt, taste, and add more only if needed. The broth is ready to sip hot or use in soups, sauces, and grains. If you want to remove the fat, refrigerate the broth until cold and lift off the firm layer before using; chilling is only needed for that step, not to finish the recipe.

Tips

Mix marrow bones with joint bones. Marrow bones give the broth a rounded, rich flavor, while knuckle or joint bones tend to contribute more gelatin. A mix usually gives a better balance than using marrow bones alone. Ask a butcher for cross-cut beef marrow bones and joint bones if the labels at the store are unclear.
Keep the bones below the water line where possible. A few exposed ends are not a problem, but mostly submerged bones cook more evenly. If your cooker is smaller, use fewer bones and reduce the water rather than forcing the full batch into the pot.
Season lightly at the start. Broth reduces only a little in a covered slow cooker, but its flavor can still be concentrated. Adding most of the salt after straining gives you better control, especially if you plan to use the broth in a recipe that already contains salty ingredients.
Use a fine strainer and cool promptly. Fine particles can make broth cloudy, so strain gently without pressing the vegetables or bones through the mesh. For storage, divide the broth into shallow containers so it cools more quickly.

Serving Suggestions

Serve the broth in small mugs or bowls, hot and simply seasoned with a little salt and black pepper. A squeeze of lemon, sliced scallion, or a few fresh parsley leaves can brighten a mug without overpowering the beef flavor. If a chilled layer of fat forms on top, remove it for a cleaner-tasting broth, or keep a small amount when you want a richer finish.

Use it anywhere a savory beef stock would work: simmer it with noodles and vegetables for a quick soup, cook rice or barley in it, or add a splash to a pan sauce. It can also be the liquid base for braised vegetables or beans. Because this broth is not heavily salted, taste the finished dish before adding extra seasoning. For a simple bowl, add cooked noodles, shredded cooked beef, and tender vegetables rather than trying to cook raw ingredients in a mug of reheated broth.

Variations

Use a different vinegar. Replace the apple cider vinegar with 2 tablespoons (30 ml) of plain white vinegar or mild rice vinegar. White vinegar has a sharper aroma, while rice vinegar is milder; either works in this small amount. Avoid strongly flavored balsamic vinegar, which can make the broth sweet and dark.
Add more aromatics. Include 1 teaspoon (2 g) of coriander seeds or a small sprig of thyme, about 2 g, with the other seasonings. Keep additions restrained so the broth remains useful in several dishes. A small piece of fresh ginger, about 15 g, gives it a warmer, lightly fragrant character.
Make it more vegetable-forward. Add another carrot, about 75 g, or one leek, about 150 g, washed well and cut into large pieces. Leek gives a softer, sweeter allium flavor than onion. Do not add a large pile of vegetables, since they can crowd out the bones and make the finished broth taste more like vegetable stock.
Choose a lighter broth. Use more joint bones and fewer marrow bones, keeping the total bone weight at 4 lb (1.8 kg). The result will generally taste less rich. For a stronger beef flavor, you can use all marrow bones, though the broth may be fattier and less gelatinous when chilled.

Storage and Reheating

Refrigerate the broth within 2 hours of cooking. For a large batch, divide it into shallow, heatproof containers; placing those containers in an ice bath and stirring occasionally helps the broth cool faster. Once chilled, cover the containers. The broth keeps for 3–4 days in the refrigerator. A firm fat cap may form on top; remove it before reheating if you prefer a less rich broth.

For longer storage, freeze the broth in freezer-safe containers or measured portions, leaving a little room for expansion. Use within about 3 months for best flavor. Thaw it in the refrigerator or reheat it directly from frozen in a saucepan over low heat, stirring as it melts. Reheat refrigerated or thawed leftovers until they reach 165°F (74°C), the USDA FSIS recommendation for leftovers, and use a food thermometer to check. Avoid leaving broth at room temperature to cool for an extended period, and do not store it in a slow cooker that has been switched off.

Frequently Asked Questions

Can I make bone marrow broth with only marrow bones?
Yes. Use 4 lb (1.8 kg) of beef marrow bones and the same amount of water and aromatics. The broth will usually be richer and may have more fat, but it can be less gelatinous than a batch that includes knuckle or joint bones. Chill it if you want to lift off the fat before serving.

Can I cook this on High for the whole time?
Low heat is the better choice for the long cooking period because it keeps the liquid at a gentler simmer. If you need to use High, check your slow cooker’s guidance and begin checking the broth after about 6 hours; cooking speed varies by appliance and batch size. The flavor may be less mellow, and the liquid may bubble more actively.

Why did my broth turn cloudy?
Cloudiness is usually a matter of appearance, not a sign that the broth has failed. It can happen when the liquid bubbles vigorously, when the bones are disturbed, or when solids pass through a coarse strainer. Keep the lid on, use Low after the initial hour, and strain through fine mesh for a clearer result.

Why didn’t the broth gel after chilling?
Broth that does not gel can still be used. The amount of gelatin varies with the bones, their proportions, the water level, and the slow cooker. Next time, include more knuckle or joint bones, keep the water just high enough to cover, or cook a little longer. Marrow itself adds richness but does not guarantee a firm gel.

Do I have to roast the bones first?
No, but roasting gives the finished broth a deeper, more browned flavor. For a lighter, less roasted taste, skip the oven and place the thawed bones directly in the slow cooker. The broth will still cook, though its color and flavor will be different. Keep the same slow-cooker timing and ingredients.

Can I add salt at the beginning?
You can, but it is easier to control the final seasoning if you wait until the broth is strained. That matters most if the broth will be reduced or added to a dish with salted stock, cured meat, or salty cheese. Start with a small amount, taste, and adjust in the final recipe.

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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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