Asahi Grill Oxtail Soup Recipe: Deep Umami Richness From Slow-Simmered Bones

This Asahi Grill oxtail soup recipe delivers the deep, umami-rich broth and melt-in-your-mouth oxtail that makes it a restaurant staple. 🔥 The secret lies in slow-braising the bones until they release their marrow and collagen, transforming tough cuts into luxurious, tender meat.

I've adapted the professional techniques I learned from years of working with slow-cooked meats to create a version that works beautifully in your home kitchen.

The process begins with a flavorful base of ginger, garlic, and star anise that infuses the broth with aromatic depth. As the oxtail simmers for hours, it develops a rich, velvety texture while the broth becomes so concentrated it practically sings with umami.

This isn't just soup—it's a complete meal with every spoonful packed with flavor and substance.

By the time you're done, you'll have perfectly tender oxtail pieces that fall apart at the touch of a fork, swimming in a glossy broth that coats your spoon. The mushrooms add earthy notes, while the ginger and star anise provide that signature aromatic complexity that makes this soup unforgettable.

It's the kind of dish that transforms an ordinary weeknight into something special.

Serve with steamed rice or crusty bread to soak up every last drop of that luxurious broth. The leftovers reheat beautifully, making this an ideal meal prep option for busy weeks. Let's get started on creating this restaurant-quality oxtail soup at home.

Ingredients for asahi grill oxtail soup

Six ingredients for the broth, six for the oxtail—just enough to create restaurant-quality depth.

The oxtail is non-negotiable here. Look for bone-in pieces at an Asian market or specialty butcher—they'll have it pre-cut if you ask. Costco often carries it too, but check the marbling. The more fat, the richer the broth. Ginger and star anise are your flavor anchors—fresh ginger is a must, but if you can't find whole star anise, crushed pods work. The shiitake mushrooms add earthiness that balances the richness, so don't skip them. For soy sauce, Lee Kum Kee dark soy is ideal if you want that signature color, but regular soy works too.

No Shaoxing wine? Dry sherry or even a splash of white wine vinegar gets you close. Chicken stock? Vegetable stock plus a bouillon cube works in a pinch, but the flavor won't be as deep. The mushrooms can be any variety—cremini or oyster both work, but shiitake is traditional. For the cornstarch slurry, use cold water to mix it, or it'll clump. And if you're worried about the broth being too thin, just add a little more cornstarch—you can always thicken it later. The sesame oil is for finishing, so grab the toasted kind (Trader Joe's has it) for that nutty aroma.

This soup tastes even better the next day—4-5 days in the fridge, 3 months frozen. I always make a double batch because the leftovers reheat perfectly. Store it in airtight containers with the lid slightly loose so the flavors don't get trapped. For serving, I like to bring the broth to a simmer before ladling it over rice—jasmine rice is perfect—so the steam rises and fills the room with that incredible aroma. The oxtail pieces keep well too, so you can reheat them separately if you prefer your broth clearer.

Step-by-step instructions for Asahi Grill oxtail soup

Let's create this restaurant-style oxtail soup with layers of umami and rich, velvety broth.

Heat a large Dutch oven over medium-high heat until hot. Working in batches, add the 3 lb oxtail and sear for 3-4 minutes per side until deeply browned. You're developing that caramelized crust that will dissolve into the broth later, creating deep flavor.

Don't rush this step—you want that beautiful mahogany color. If the oxtail releases easily from the pan, it's ready. Transfer the seared oxtail to a plate and set aside. You'll notice the aroma changing as it cooks, that's the Maillard reaction working its magic.

In the same Dutch oven, add 2 tablespoons neutral oil (not listed but essential for this step) and heat until shimmering. Add the 2 whole yellow onion chunks and cook for 5 minutes until softened and lightly golden. Add the 8 smashed garlic cloves and 0.5 cup julienned ginger, cooking for another 2 minutes until fragrant.

Here's where the magic happens: add the 2 whole star anise, 1 cinnamon stick, and 4 bay leaves. These spices will infuse the broth with complex, warming notes. Stir everything together and cook for 1 minute until the spices release their aroma—your kitchen should smell amazing right now.

Pour in the 0.5 cup soy sauce and 0.25 cup Shaoxing wine, scraping up any browned bits from the bottom of the pot. Add the 4 cups chicken stock and 4 cups water, then return the oxtail to the pot. Bring to a gentle boil, then reduce heat to low and cover partially.

Simmer for 2 hours until the oxtail is fork-tender and falls apart easily. I check for doneness by inserting a fork—if it slides in with minimal resistance, it's ready. This long cook time is crucial for extracting all the collagen from the bones and connective tissue, creating that signature silky texture.

Add the 8 whole shiitake mushrooms to the pot and continue simmering for another 30 minutes. The mushrooms will absorb the rich broth and develop that perfect meaty texture. Meanwhile, in a small bowl, whisk together the 1 tbsp cornstarch with 2 tablespoons water to make a slurry.

Ladle about ½ cup of the hot broth into the slurry and whisk until smooth. Return this mixture to the pot and simmer for 5-10 minutes until the broth thickens slightly but remains silky. You want it to coat the back of a spoon but still be pourable—not gluey. Taste and adjust seasoning with additional soy sauce if needed.

Remove the oxtail pieces and strain the broth through a fine-mesh sieve into a clean pot. Discard the solids. Return the broth to the heat and stir in the 1 tbsp toasted sesame oil. This final touch adds nutty depth and balances the rich flavors. Shred the oxtail meat with two forks and return it to the broth.

Ladle the hot soup into bowls and garnish each serving with 0.25 cup sliced green onions. The contrast of the fresh green onions against the deep red broth creates a visually stunning dish. Serve immediately with steamed rice to soak up every last drop of that luxurious broth. This soup gets even better the next day as the flavors continue to meld!

Regional styles of this dish

Hong Kong-Style

In Hong Kong, oxtail soup often includes a touch of dried scallops and dried shrimp for extra umami depth. I add 2 dried scallops and 4 dried shrimp (soaked in hot water for 20 minutes) to the broth during the final 30 minutes of simmering.

The soup becomes even richer with a subtle briny note. Garnish with cilantro instead of green onions for that Hong Kong street-food vibe. 🌟

Japanese Shabu-Shabu Fusion

For a lighter take, blend Japanese techniques with the soup by adding yuzu kosho (citrus chili paste) at the end. I use 1 teaspoon for a bright, tangy kick.

Serve with shabu-shabu dipping sauce—a mix of 1 tbsp soy sauce, 1 tbsp mirin, and ½ tsp grated daikon—on the side. The contrast of the citrusy broth with the tender oxtail is incredible. 🍋