Creamy Roasted Kabocha Squash Soup

Roasting kabocha first brings out its chestnut-like sweetness. Blend it with coconut milk, vegetable stock, and garlic for a silky vegan soup in about 50 minutes.

I’m in love with kabocha squash these days! Fall is finally here, and it’s cold enough to really enjoy warm soups again. Kabocha squash is also known as Japanese pumpkin, which makes this a vegan Japanese pumpkin soup. It’s soothing and comforting on a chilly fall day.

For this soup, I start with roasted kabocha squash, then blend the flesh with lite coconut milk, vegetable stock, and a couple of garlic cloves until it’s completely smooth. A quick boil on the stove brings it together, and a swirl of reserved coconut milk finishes each bowl.

The result is creamy, nutty, and naturally sweet, on the thicker side, and vegan and gluten-free without any special swaps. If you’re already a kabocha fan, try my kabocha squash fries next, or browse my kabocha squash recipe roundup for more ideas.

Recipe at a Glance

What it is: A blended soup of roasted kabocha squash, lite coconut milk, vegetable stock, and garlic. Vegan and gluten-free, with about 7 net carbs per serving.

Why it works: Roasting deepens kabocha’s natural sweetness, and coconut milk adds richness without dairy. A high-speed blender makes the soup silky and smooth.

Time: 10 minutes prep and 40 minutes cook, about 50 minutes total, including roasting the squash.

Make-ahead: Roast the kabocha up to 3 days ahead and refrigerate it, or freeze roasted kabocha for up to 1 month. The finished soup keeps in an airtight container in the fridge for up to 3 days.

Serve with: A crusty loaf of sourdough ciabatta, slices of my soft pumpkin sourdough bread (also made with kabocha), or toasted Japanese milk bread for dipping.

Key substitutions: Water works in place of vegetable stock. Boiled kabocha works in place of roasted (steps in the recipe card).

Optional add-ins: Grated ginger, cinnamon, nutmeg, brown sugar or maple syrup, or miso. Stir in one or a combination when the soup goes back into the pot.

What is Kabocha Squash?

Kabocha is a Japanese winter squash, also called Japanese pumpkin. In Korea it’s called danhobak, which means “sweet pumpkin.” It’s widely popular in both Japan and Korea, where it shows up in savory side dishes, sweet soups, and desserts. It has hard, dark green skin, sometimes with a yellow spot where it ripened, and bright orange flesh.

Compared with other winter squash, kabocha is sweeter and has a fluffier texture once cooked, similar to roasted chestnuts or sweet potato. That fluffy flesh is exactly why it blends into such a thick, velvety soup.

How to pick one: Look for a kabocha that feels heavy for its size with no soft spots, and check the stem for mold. Hard, bumpy spots on the skin are normal and fine. For step-by-step photos on cutting one safely, see my roasted kabocha squash post.

Why Roast the Kabocha First?

Roasting intensifies kabocha’s sweetness, and that concentrated flavor carries straight into the soup. I roast the wedges at 400°F, which lightly caramelizes the surface.

You can boil the kabocha instead if you’re short on time, and the recipe card includes those steps. One reader who made it both ways said it was delicious either way, but the roasted version had more depth of flavor.

Ingredients for Kabocha Squash Soup

• Roasted kabocha squash: 3 cups of roasted flesh.
• Vegetable stock: Thins the soup and adds savory depth. Water works too.
• Lite coconut milk: Makes it creamy without dairy. Save 1/4 cup for swirling on top.
• Garlic: Two cloves, roughly chopped.
• Salt and pepper: Season at the end, after the soup has boiled.
• Fresh herbs: I use parsley and cilantro to garnish.
• Optional flavorings: Ginger, cinnamon, nutmeg, brown sugar or maple syrup, or miso. See variations below.

How to Make Roasted Kabocha Squash Soup

1. Cut and seed the kabocha. Slice off the stem to expose the orange flesh, which is much easier to cut into than the hard skin. Push the tip of a heavy knife into the flesh and rock it down to cut the squash in half. Scoop out the seeds with a spoon, then cut each half into 3 or 4 wedges. If the squash is too hard to cut, microwave it whole for about 2 minutes, then in 90-second bursts until it gives, or bake it loosely covered in foil at 375°F for 15 minutes and let it cool.

2. Roast at 400°F. Coat the wedges generously with avocado oil or another high-heat oil, then set them skin-side down on a baking sheet. Roast on the center rack for 35 minutes, until the surface is golden brown. The oil soaks slightly into the flesh, which is what gives you that golden, caramelized edge. Full details are in my roasted kabocha squash recipe.

3. Scoop out the flesh. Roasted kabocha is soft enough to scoop with a spoon. Peel or scoop away the skin if you want a bright yellow-orange soup. Leaving it on darkens the color but doesn’t change the taste. Measure out 3 cups.

4. Blend until silky. Add the kabocha, vegetable stock, garlic, and 3/4 cup of the coconut milk to a high-speed blender. Save the last 1/4 cup of coconut milk for serving. Blend on high until completely smooth, working in batches if your blender is small.

5. Boil and season. Pour the blended soup into a large pot and stir in any optional flavorings. Bring the soup to a boil and cook for 3 to 4 minutes. Season with salt and pepper to taste.

6. Swirl and garnish. Ladle the soup into bowls. Drizzle the reserved coconut milk over the top and drag a spoon or skewer through it to make a swirl. Finish with fresh herbs and cracked black pepper, and serve hot.

Flavor Variations

This soup is mild and naturally sweet, so it takes add-ins well. Stir one or a combination into the pot after blending, before the soup boils. Start with the amount below and add more to taste.

• Warm spice: 1 teaspoon ground cinnamon.
• Nuttier: 1/4 teaspoon nutmeg.
• Brighter: 1 teaspoon freshly grated ginger.
• Sweeter: 1 tablespoon brown sugar or maple syrup.
• More savory: 1 tablespoon miso.

Make Ahead and Storage

Fridge: Keep leftovers in an airtight container for up to 3 days.

Freezer: Freeze the soup in a freezer-safe container for up to 2 to 3 months. You can also freeze roasted kabocha on its own for up to 1 month. Wrap it in plastic wrap and store it in a zip-top bag or freezer-safe container, then blend it into soup whenever you’re ready.

Frequently Asked Questions

If this kabocha soup has you craving more blended bowls, try my Instant Pot vegan butternut squash soup or my silky sweet corn soup. For more ways to use the rest of your squash, my kabocha squash fries and the full kabocha squash recipe roundup are good next stops.

If you make this roasted kabocha squash soup, I’d love to hear how it went. Leave a rating and a comment below, and tell me which flavorings you added. You can also browse all my soup recipes.

Thanks so much for stopping by!