Ash Reshteh Soup Recipe: Persian Herb-Infused Noodle Comfort in One Pot

This ash reshteh soup recipe brings the heart of Persian home cooking to your kitchen with its fragrant, herb-infused broth and tender noodles. The dish, traditionally served at celebrations, relies on ash extract and dried limes for its signature depth—a flavor profile that transforms simple ingredients into something deeply comforting.

What makes this recipe special is its balance of earthy lentils, delicate noodles, and aromatic herbs, all simmered together in a single pot.

The foundation of ash reshteh lies in its broth, where sautéed onions and garlic form the base before lentils and noodles are added. The ash extract, a key ingredient, adds a subtle tanginess that elevates the soup beyond ordinary vegetable broths.

While traditional recipes call for specific Persian ingredients like reshteh noodles and dried limes, modern adaptations allow for substitutions like dried herbs or lemon zest if needed. The result is a soup that’s both nostalgic and approachable.

By the time you serve this dish, you’ll have a steaming bowl of restaurant-quality ash reshteh—rich in texture and flavor, with tender lentils, al dente noodles, and a broth that’s fragrant and satisfying.

The dish pairs beautifully with fresh herbs for garnish and a side of crusty bread to soak up every last drop. Whether you're cooking for a gathering or a cozy night in, this recipe delivers warmth and tradition in every spoonful.

For those new to Persian cooking, don’t let unfamiliar ingredients intimidate you. This recipe breaks down each step clearly, from soaking the noodles to balancing the flavors, ensuring you achieve the same comforting results as in a Persian home.

The process is methodical yet forgiving, making it perfect for both beginners and seasoned cooks alike.

Ingredients for ash reshteh soup

Persian ingredients meet homestyle comfort in this fragrant one-pot soup.

The reshteh noodles and brown lentils are the heart of this dish—look for Persian reshteh at Middle Eastern markets or use thin spaghetti in a pinch. Dried limes (or lemon zest) are key for that signature tang, but don't stress if you can't find them. Ash extract is traditional, though lemon juice works beautifully as a substitute. For the best flavor, toast your spices in a dry pan for 30 seconds before adding to the soup—this brings out their aromatic oils. Costco often carries dried limes in their international section, while Whole Foods has a good selection of Persian ingredients.

No dried limes? Lemon zest plus a splash of lemon juice gets you close. Fresh herbs like parsley and dill should be bright green and vibrant—wilted stems won't add the same freshness. The ash extract can be tricky to find; if you can't locate it, add an extra tablespoon of lemon juice and a pinch of cream of tartar for tang. For the lentils, rinsing thoroughly removes impurities and reduces cooking time. The reshteh noodles can be soaked in warm water for 10 minutes to soften slightly before adding to the pot—this helps them cook more evenly. Diamond Crystal kosher salt is my go-to for seasoning soups like this.

This soup tastes even better the next day as flavors meld. Store leftovers in an airtight container in the fridge for up to 4 days, or freeze for 3 months in portions. The reshteh noodles will soften further when reheated, so add a splash of water if they seem too firm. For serving, garnish with extra herbs and a drizzle of lemon juice just before eating. The dish pairs perfectly with warm pita bread or crusty sourdough to soak up every last drop of that fragrant broth.

Step-by-step instructions for ash reshteh soup

This one-pot Persian classic delivers hearty comfort with tender lentils and delicate noodles.

Heat the 0.25 cup vegetable oil in a large pot over medium heat until shimmering. Add the 1 whole yellow onions, chopped into small pieces, and cook for 5-6 minutes until softened and translucent. The onions should release their sweetness without browning.

Add the 4 cloves garlic cloves, minced, along with the 0.5 tsp ground cumin, 0.5 tsp ground coriander, and 0.25 tsp ground turmeric. Stir for 30 seconds until the garlic becomes fragrant—this is where the soup's signature warmth develops. The spices should bloom without burning, releasing their earthy, citrusy notes into the oil.

Add the 1 cup brown lentils to the pot and stir for 2 minutes to lightly toast, which enhances their nutty flavor. Pour in the 6 cups water and bring to a boil over high heat. Once boiling, reduce heat to medium-low and let it simmer uncovered for 20-25 minutes until the lentils are tender but not mushy.

Here's the thing—don't skip the uncovered simmer. This allows excess moisture to evaporate, preventing a watery soup later. You'll know the lentils are ready when they hold their shape but are fork-tender, with a slight bite remaining. If the liquid reduces too much before the lentils are done, add ½ cup water at a time to maintain the broth consistency.

Stir in the 1 tbsp dried limes (or lemon zest) and 1 tbsp ash extract (or lemon juice)—this is where the soup's signature tangy depth comes from. Add the 1 tsp salt and 0.5 tsp ground black pepper, then simmer for another 5 minutes to let the flavors meld. The acidity from the ash extract will brighten the earthy lentils and spices.

Now, add the 0.5 cup persian reshteh noodles and stir gently to distribute them evenly. The noodles will cook quickly in the hot broth, so don't let them clump together. Let the soup simmer for an additional 3-4 minutes until the noodles are tender and the broth has thickened slightly. The noodles should be al dente, with a slight bite that softens as the soup rests.

Remove the pot from heat and stir in the 0.25 cup fresh parsley and 0.25 cup fresh dill, chopped. These herbs add a vibrant finish and should be added just before serving to preserve their bright, fresh flavors. Let the soup rest for 5 minutes to allow the noodles to absorb any remaining broth and the flavors to settle.

Taste and adjust the seasoning if needed—Persian soups often benefit from a final balance of salt and acid. The ash extract or lemon juice might need a touch more, depending on your preference. Serve the soup warm, garnished with additional fresh herbs if desired. Each spoonful should deliver a harmonious blend of earthy lentils, delicate noodles, and bright, herbaceous notes.

Best sauces and condiments for this ash reshteh soup

Persian Herb Oil

Elevate your ash reshteh with a simple Persian herb oil by blending 2 tbsp fresh dill, 2 tbsp fresh parsley, 1 tbsp minced garlic, and ½ cup extra-virgin olive oil. Let it infuse for 15 minutes before drizzling 1 tbsp over each bowl of soup.

This adds a vibrant, aromatic finish without overpowering the dish’s delicate balance. Store the remaining oil in an airtight container in the fridge for up to 5 days. 🌿

Tahini Swirl

For a creamy, nutty depth, stir 1 tbsp tahini into 2 tbsp warm broth from the pot, then whisk until smooth. Drizzle 1 tsp over each serving just before eating.

The tahini’s richness complements the soup’s earthy lentils and bright herbs, creating a luxurious texture. Use Kirkland Signature tahini for a smooth, high-quality base. 🥛

Yogurt Drizzle

Balance the soup’s tanginess with a cooling yogurt drizzle. Mix ¼ cup plain Greek yogurt with 1 tsp lemon juice and a pinch of salt, then drizzle 1 tsp over each bowl.

The yogurt’s creaminess contrasts beautifully with the broth’s depth, while the lemon juice brightens the flavors. Use Fage 5% fat yogurt for the perfect balance of richness and tang. 🥄

Fresh Herb Garnish

No sauce needed—just a sprinkle of fresh herbs can transform your soup. Chop 1 tbsp fresh dill and 1 tbsp fresh parsley into fine pieces, then scatter over each serving. For extra flair, add a pinch of crushed red pepper flakes or a few toasted pine nuts for crunch.

The herbs should be added right before serving to keep their vibrant color and freshness. 🌱

Lemon-Ash Extract Finish

If you’re short on ash extract, boost the tang with a lemon-ash finish. Mix 1 tbsp lemon juice with ½ tsp cream of tartar (for extra tartness), then drizzle ½ tsp over each bowl.

This mimics the traditional ash extract’s depth while keeping the soup bright and refreshing. Adjust to taste—Persian soups often need a final acid kick. 🍋

Garlic-Onion Jam

For a bold, umami twist, prepare a quick garlic-onion jam by caramelizing 2 tbsp chopped onions and 1 tbsp minced garlic in 1 tbsp oil until deep golden. Stir into the soup during the last 5 minutes of cooking.

The jam’s concentrated sweetness and savory depth add complexity without overpowering the dish. Use a nonstick pan for easy cleanup. 🧅

Frequently asked questions