Roasted Thai Butternut Squash Soup

Posted on October 10, 2023

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This Roasted Thai Butternut Squash Soup is rich, creamy, and packed with bold Thai flavors that make every spoonful incredible! This isn't your typical butternut squash soup, it gets a serious upgrade with aromatic ingredients like fresh ginger, garlic, lemongrass, and Thai red curry paste that bring warmth and complexity. The secret to the deep, caramelized flavor is roasting the butternut squash and red bell pepper first until they're soft, slightly charred, and intensely sweet. That roasting step transforms the vegetables and adds a depth you just can't get from boiling or steaming. Once the squash is roasted, it gets blended with sautéed aromatics, creamy coconut milk, vegetable broth, and a touch of fish sauce that adds umami and balances all the flavors perfectly. The lemongrass infuses the soup with this bright, citrusy note while it simmers, then gets removed before blending so you're left with just the flavor, not the fibrous stalk. When you blend everything together, you get this gorgeous orange soup that's silky smooth, creamy from the coconut milk, and has layers of flavor from sweet roasted squash, spicy curry paste, aromatic ginger and lemongrass, and that subtle funkiness from the fish sauce. The best part is the toppings, a drizzle of reserved coconut milk creates a beautiful swirl, fresh cilantro adds brightness, crispy shallots give you that satisfying crunch, thinly sliced red chili brings heat, and a squeeze of fresh lime ties it all together with acidity. Serve this with warm roti or crusty bread for dipping and you have a complete, comforting meal that tastes like it came from your favorite Thai restaurant but is actually super easy to make at home!

Frequently Asked Questions

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Q: Can I use pre-cut butternut squash to save time?

A: Absolutely! Pre-cut butternut squash from the grocery store is a huge time-saver and works perfectly for this recipe. You'll need about 6-7 cups of cubed squash. Just make sure to pat the pieces dry with a paper towel before roasting since pre-cut squash can be a bit wet, and you want that caramelization! The only downside is that pre-cut squash is more expensive than whole squash, but it's worth it if you're short on time or find peeling and cubing butternut squash intimidating. You can also sometimes find frozen butternut squash, though fresh or pre-cut fresh will give you the best roasted flavor..

Q: I can't find lemongrass. What can I substitute?

A: Lemongrass adds that unique citrusy, aromatic flavor that's hard to replicate, but if you can't find it, you have options! You can use the zest of 1 lemon plus 1 teaspoon of lemon juice added at the end of cooking, this won't be exactly the same but will give you some citrus brightness. Lemongrass paste (found in tubes in the produce section) is another option, use about 1 tablespoon. In a pinch, you could also add a couple of makrut lime leaves if you have access to those, or just skip it entirely and let the ginger and curry paste shine. The soup will still be delicious, just slightly less complex without the lemongrass.

Q: Can I make this soup in a slow cooker or Instant Pot?

A: Yes, with some modifications! For the slow cooker, you'll still want to roast the squash and bell pepper first for that caramelized flavor, then add everything to the slow cooker with the sautéed aromatics and cook on low for 4-6 hours or high for 2-3 hours. Blend at the end. For the Instant Pot, sauté the aromatics using the sauté function, add the roasted squash, bell pepper, and liquids, then pressure cook on high for 8 minutes with a quick release. Blend until smooth. Both methods work, though stovetop gives you the most control over texture and allows you to taste and adjust as you go.

Q: How can I make this soup more filling as a main course?

A: This soup is quite filling on its own thanks to the butternut squash and coconut milk, but there are several ways to make it even heartier! Add cooked protein like shredded rotisserie chicken, cooked shrimp, or crispy tofu cubes when serving. Stir in cooked rice noodles, jasmine rice, or quinoa to make it more substantial. Serve it with a side of spring rolls, dumplings, or a fresh Thai-inspired salad. You could also add chickpeas or white beans during the simmering step for plant-based protein and extra fiber. Finally, don't underestimate the power of good bread, a big piece of crusty bread or warm roti makes this feel like a complete, satisfying meal!

This Roasted Thai Butternut Squash Soup is rich, creamy, and packed with flavor! Butternut squash and red bell pepper get roasted until caramelized, then blended with aromatic Thai red curry paste, coconut milk, lemongrass, and ginger for a soup that's warming, slightly spicy, and absolutely delicious. The roasting step adds incredible depth, while the coconut milk makes it silky smooth. Top it with crispy shallots, fresh cilantro, and a squeeze of lime for the perfect cozy meal!

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Preparations

Prep Time:

15 minutes

Cook Time:

40 minutes

Total Time:

55 minutes

Cuisine:

Thai

Course:

Soup, Main Course

Calories:

280 kcal (approx. per serving)

Servings:

6

Author:

Ronica Rupan
Ingredients

Ingredients

For the Soup:

  • 3½ pounds butternut squash, peeled and cubed (about 1 large squash)
  • 1 red bell pepper, halved and seeded
  • 2 tablespoons coconut oil (or olive oil), divided
  • 1 teaspoon curry powder
  • Sea salt, to taste
  • 1 medium onion, diced
  • 4-5 garlic cloves, minced
  • 1-inch piece fresh ginger, minced
  • 1 stalk lemongrass, bruised (smash it with the back of a knife)
  • 3 tablespoons Thai red curry paste
  • 1 can (13.5 oz) full-fat coconut milk, divided (reserve ¼ cup for drizzling)
  • 2½ cups low-sodium vegetable broth
  • 1 tablespoon fish sauce (or vegan fish sauce for plant-based)

For Garnish:

  • Fresh cilantro, chopped
  • Thinly sliced red chili (optional, for heat)
  • Crispy fried shallots
  • Lime wedges

Instructions

1. Roast the Vegetables
Preheat your oven to 425°F (220°C). Line a large baking sheet with parchment paper. Toss the cubed butternut squash and halved red bell pepper with 1 tablespoon of coconut oil, curry powder, and a generous sprinkle of sea salt. Spread everything in a single layer on the baking sheet, making sure the pieces aren't crowded. Roast for 25-30 minutes, flipping halfway through, until the squash is caramelized, soft, and has some charred edges. The bell pepper should be tender and slightly blistered. This roasting step is crucial for developing deep, sweet, caramelized flavor, so don't skip it!

2. Build the Aromatic Base
While the vegetables roast, heat the remaining 1 tablespoon of coconut oil in a large pot or Dutch oven over medium heat. Add the diced onion and sauté for 3-4 minutes until it starts to soften and turn translucent. Add the minced garlic, minced ginger, and bruised lemongrass stalk. Sauté for 2-3 minutes, stirring frequently, until everything is fragrant and the onions are soft. Your kitchen should smell amazing at this point!

3. Toast the Curry Paste
Add the Thai red curry paste to the pot with the aromatics. Stir and cook for 2-3 minutes, letting the curry paste toast slightly. This step wakes up the spices and releases all those complex flavors. The paste should become very fragrant and darken slightly.

4. Combine and Simmer
Once the squash and bell pepper are done roasting, remove the skin from the bell pepper and discard it. Add the roasted squash and bell pepper to the pot with the aromatics, stirring briefly to coat everything in that curry mixture. Pour in most of the coconut milk, reserving ¼ cup for drizzling later. Add the vegetable broth and fish sauce. Stir everything together, bring to a gentle simmer, and let it cook for 8-10 minutes so all the flavors can meld together beautifully.

5. Remove Lemongrass and Blend
Use tongs to fish out the lemongrass stalk and discard it, it's done its job of infusing the soup with flavor. Using an immersion blender, blend the soup directly in the pot until completely smooth and creamy. If you don't have an immersion blender, carefully transfer the soup in batches to a regular blender, blend until smooth (be careful with hot liquid!), and return to the pot. The soup should be velvety, silky, and a gorgeous orange color.

6. Taste and Adjust
Taste the soup and adjust the seasonings. You might want to add more salt, a bit more curry paste for heat, or an extra splash of fish sauce for depth. If the soup is too thick, thin it with a little more vegetable broth or coconut milk. If it's too thin, let it simmer for a few more minutes to reduce slightly.

7. Serve and Garnish
Ladle the hot soup into bowls. Drizzle each bowl with some of the reserved coconut milk, creating a pretty swirl on top. Garnish generously with fresh chopped cilantro, crispy fried shallots for crunch, thinly sliced red chili if you want extra heat, and serve with lime wedges on the side for squeezing. Serve with warm roti, naan, or crusty bread for dipping and soaking up all that delicious soup!

Cooking hacks and tips

Tips & Notes

  • Don't skip roasting: The roasting step is what makes this soup special! It caramelizes the squash and bell pepper, creating deep, sweet flavors you can't get any other way.
  • Peeling butternut squash: Use a sharp vegetable peeler or a knife. Cut off both ends first for stability, then peel from top to bottom in strips.
  • Lemongrass prep: Bruise the lemongrass stalk by smashing it with the back of a knife or a rolling pin. This releases the aromatic oils. You'll remove it before blending.
  • Thai red curry paste: Find it in the international aisle or Asian markets. Brands like Thai Kitchen or Mae Ploy work great. Start with 3 tablespoons and add more if you want it spicier.
  • Fish sauce substitute: For a fully plant-based version, use vegan fish sauce or substitute with soy sauce, though the flavor will be slightly different.
  • Coconut milk matters: Use full-fat coconut milk for the creamiest, richest soup. Light coconut milk will make it less creamy.
  • Adjust consistency: If the soup is too thick, add more broth. Too thin? Let it simmer longer to reduce.
  • Make it spicier: Add more curry paste, fresh Thai chilies while cooking, or top with sliced red chilies.
  • Crispy shallots: Find these pre-made at Asian markets, or make your own by thinly slicing shallots and frying them in oil until golden and crispy.
  • Make ahead: This soup tastes even better the next day! Store in the fridge for up to 5 days or freeze for up to 3 months.
  • Reheating: Reheat gently on the stove, adding a splash of broth or coconut milk if it's thickened up.
  • Serving suggestions: Pair with jasmine rice, roti, naan, or crusty bread for a complete meal.

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Ronica

Hey! It’s Ronica!

This is where I love to share my passion for cooking, baking, and flavor. When I’m not creating delicious recipes, you’ll find me spending time with my family, working on my spice blends at Flora & Mana, or enjoying a homemade baked goods. Join me on this culinary journey to taste, healthy meals and fun kitchen hacks!

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