Indonesian Oxtail Soup Recipe: Slow-Simmered Richness with Star Anise and Lemongrass

This Indonesian oxtail soup recipe delivers the deep, aromatic richness of traditional sop buntut—a dish that transforms tough oxtail into melt-in-your-mouth tenderness through slow simmering. The secret lies in layering fragrant spices like star anise, lemongrass, and kaffir lime leaves, which infuse the broth with complex, earthy notes.

I’ve perfected this version after years of testing, ensuring every bite carries both bold flavor and comforting depth.

The process begins with browning the oxtail to develop a rich, caramelized crust before adding aromatic spices and vegetables in stages. A 3-4 hour simmer breaks down collagen, transforming the meat into fork-tender perfection while creating a velvety, flavor-packed broth.

This isn’t just a soup—it’s a labor of love, where patience rewards you with restaurant-quality results at home.

What makes this recipe special is its balance: the oxtail’s natural richness is complemented by bright citrus (from lime leaves) and subtle heat (optional chili), creating harmony in every spoonful.

The final dish serves as a hearty centerpiece, best enjoyed with steamed jasmine rice and a side of sambal for dipping. Each component—from the spices to the simmering time—has been refined to deliver authentic Indonesian comfort.

Whether you’re preparing for a family gathering or a cozy weeknight meal, this soup promises warmth and satisfaction. The technique is straightforward, but the reward is unmatched—deep flavor, tender meat, and a broth so rich it tastes like a hug in a bowl.

Let’s get started on creating this timeless dish.

Ingredients for indonesian oxtail soup

Sixteen ingredients. Three hours of simmering. One unforgettable bowl of Indonesian comfort.

The oxtail is the heart of this dish, so look for well-marbled cuts—the fat renders down into the broth, creating that signature velvety richness. Asian markets often carry the best quality, but your butcher can source it too. If you can't find whole oxtails, pre-cut chunks from Costco work perfectly. The star anise and kaffir lime leaves? Penzeys Spices or local Asian grocers are your best bets—freshness matters here. Galangal, that ginger-like root, might be tricky to find, but substitute extra ginger if needed. Just remember: the more authentic the spices, the deeper the flavor profile.

No star anise? Anise seeds or a pinch of fennel work in a pinch, though the flavor won't be identical. Running low on kaffir lime leaves? Lime zest plus a bay leaf mimics the citrusy aroma. The galangal is non-negotiable for authenticity, but extra ginger plus a splash of lime juice gets you close. For the tomatoes, San Marzano canned adds sweetness without acidity. The coconut milk should be full-fat—Thai Kitchen brand is reliable, but any canned full-fat works. If you're feeling adventurous, swap half the broth for oxtail stock for even more depth. And trust me on the brown sugar—it balances the richness without overpowering.

This soup tastes even better the next day, so make a double batch if you can. Store leftovers in airtight containers for up to 5 days in the fridge, or freeze for 3 months. The broth thickens as it cools, so add a splash of water or broth when reheating. Serve with steamed jasmine rice and a side of sambal oelek for dipping—it cuts through the richness beautifully. The oxtail is fork-tender, so use tongs to lift it out of the broth to avoid breaking the meat. Leftovers reheat perfectly—just stir in a splash of water to loosen the broth.

Step-by-step instructions for Indonesian oxtail soup

This aromatic soup delivers deep umami richness through slow-simmered oxtail and fragrant Southeast Asian spices.

Pat the 3 lb oxtail chunks dry with paper towels—this ensures a better sear. Heat a large Dutch oven over medium-high heat and add just enough oil to coat the bottom. Working in batches, sear the oxtail for 3-4 minutes per side until deeply golden brown. You'll see the fat render and the meat develop a caramelized crust.

Resist the urge to crowd the pan—this prevents proper browning. Transfer the seared oxtail to a plate as you work. The goal is to develop maximum flavor through the Maillard reaction before we build the aromatic base. Once all pieces are browned, set them aside temporarily.

In the same Dutch oven, add the 2 whole onions and cook for 5 minutes until softened. Add the 8 cloves garlic and cook for another 30 seconds until fragrant. Now it's time for the aromatic trifecta: Add the 3 bruised lemongrass stalks, 4 torn kaffir lime leaves, 1 piece sliced galangal, 2 whole cinnamon sticks, and 2 whole bay leaves. Stir for 1 minute to release their essential oils.

Add the lightly crushed 2 whole star anise and the 0.5 tsp red chili flakes, stirring for 30 seconds. The spices should sizzle slightly and fill your kitchen with their complex aroma. This is where the soup's signature depth comes from—don't skip this step. Pour in the 6 cups chicken broth and scrape up any browned bits from the bottom of the pot.

Return the seared oxtail to the pot along with the 4 quartered tomatoes. Bring everything to a gentle boil, then immediately reduce heat to low. Cover partially and simmer for 2 hours, stirring occasionally. The soup should bubble gently—if it boils vigorously, reduce the heat further to prevent the oxtail from toughening.

After 2 hours, check for doneness by piercing the largest oxtail chunk with a fork. It should slide in easily with minimal resistance. If it's not quite tender, continue simmering for another 30-45 minutes. The broth should have reduced slightly, concentrating the flavors and creating a velvety texture.

Stir in the 1 can coconut milk, 1 tbsp brown sugar, 1.5 tsp salt, and 1 tsp freshly cracked black peppercorns. Simmer uncovered for 10 minutes to allow the coconut milk to meld with the other flavors. The soup should now have a rich, creamy texture with a beautiful balance of sweet, spicy, and umami notes.

Taste and adjust seasoning if needed—you might want to add a pinch more salt or chili flakes to suit your preference. Remove and discard the cinnamon sticks and bay leaves. The star anise and lemongrass can stay in for subtle flavor, but you can remove them if you prefer a cleaner texture.

Ladle the hot oxtail soup over individual servings of 2 cups cooked jasmine rice. The rice should be steamed to perfection—light and fluffy with a delicate floral aroma. Each bowl should contain several oxtail chunks along with the fragrant broth. Garnish with additional kaffir lime leaves if desired.

Serve immediately while the rice is hot and the soup is steaming. The contrast between the tender oxtail, creamy coconut broth, and fluffy rice creates a harmonious balance of textures and flavors. This dish tastes even better the next day as the flavors continue to meld, so consider making extra for leftovers.

Pro cooking tips for perfect results

Searing Perfection

The key to unlocking oxtail's rich flavor starts with a proper sear. Use a large Dutch oven (I love my All-Clad Stainless Steel) and work in batches—crowding the pan steams instead of sears.

Aim for deep golden brown on all sides, which takes 3-4 minutes per batch. The fat should render beautifully, creating a caramelized crust that forms the flavor foundation. 🔥

Spice Infusion Timing

Don't just toss in your spices—toast them first for maximum aroma. Lightly crush the star anise with a mortar and pestle, then add it to the onions and garlic when they're soft.

The kaffir lime leaves and galangal should sizzle for 1 minute to release their oils before adding broth. This step makes all the difference in flavor depth.

Low-and-Slow Simmering

Resist the urge to rush this process. After adding broth, maintain a gentle simmer—not a rolling boil. The oxtail needs 2-2.5 hours to become fork-tender. I use a meat thermometer to check doneness at 195°F internal temperature. The broth should reduce slightly, concentrating flavors into a velvety consistency.

Coconut Milk Integration

Adding coconut milk too early can make the broth greasy. Wait until the final 10 minutes of cooking to stir it in. Use full-fat canned coconut milk (like Thai Kitchen brand) for the creamiest texture.

The heat helps emulsify it perfectly with the other flavors, creating that signature Indonesian richness.

Flavor Balancing

The brown sugar isn't just for sweetness—it balances the umami from the oxtail and spice from the chili flakes. Taste before serving and adjust with extra salt (I use Diamond Crystal kosher) or freshly cracked black pepper. The soup should sing with complexity, not just saltiness. ✨

Equipment Essentials

While you can use any heavy pot, a Dutch oven handles the long simmer best. For temperature control, I recommend a Thermoworks Smoke thermometer—it helps maintain that gentle simmer critical for tender meat. And don't skip the wooden spoon for stirring to avoid scratching your pot's surface.

Frequently asked questions