This velvety soup turns the bold, earthy flavor of black walnuts into a rich, warming starter that feels both rustic and refined. The trick is steeping the nutmeats in hot stock and cream, then pureeing and straining for a silky texture that lets the unique flavor shine without any grittiness. It’s a genuinely useful way to use a fall forage or a gift of nuts from a friend’s tree.
Ingredients
- 2 tablespoons (28 g) unsalted butter
- 1 medium yellow onion, chopped (about 1 cup / 150 g)
- 2 stalks celery, chopped (about 1 cup / 120 g)
- 2 cloves garlic, minced
- 1 cup (120 g) shelled black walnuts, plus extra chopped for garnish
- 4 cups (960 ml) chicken or vegetable stock
- 1 cup (240 ml) heavy cream
- 1 teaspoon salt, plus more to taste
- 1/2 teaspoon black pepper
- 1/4 teaspoon ground nutmeg
- 1 bay leaf
Instructions
- In a large pot or Dutch oven, melt the butter over medium heat. Add the onion and celery and cook, stirring occasionally, until softened, about 5 minutes. Add the garlic and cook for 1 minute more.
- Add the black walnuts and stir to coat with the butter and aromatics. Cook for 2 minutes to toast the nuts slightly, which deepens their flavor.
- Pour in the stock and add the bay leaf. Bring to a boil, then reduce the heat to low, cover, and simmer for 30 minutes. The nuts should be soft and the liquid deeply flavored.
- Remove the bay leaf. Using an immersion blender, puree the soup until smooth. Alternatively, transfer in batches to a countertop blender and blend until smooth, then return to the pot. Be careful with hot liquid – vent the lid and cover with a towel.
- Stir in the heavy cream, salt, pepper, and nutmeg. Heat over medium-low, stirring often, until the soup is hot but not boiling. Taste and adjust salt.
- Serve hot, garnished with a swirl of cream and a sprinkle of chopped black walnuts.
Tips
- Black walnuts are intense: They have a much stronger, slightly bitter flavor than English walnuts. If you’re new to them, start with 3/4 cup and add more to taste after blending.
- Straining for silkiness: For an extra-smooth texture, press the pureed soup through a fine-mesh sieve before adding the cream. This removes any tiny bits of nut skin.
- Toasting matters: Don’t skip the initial toasting step – it mellows the raw edge and brings out the nutty aroma. Keep an eye on them so they don’t burn.
- Make it vegan: Use olive oil instead of butter, vegetable stock, and coconut cream or a plant-based cream in place of heavy cream. The flavor will be slightly different but still delicious.
Serving Suggestions
Serve this soup as a first course for a fall dinner party, perhaps with a crusty baguette or a simple green salad. It also pairs beautifully with roasted poultry or pork. For a more substantial meal, top with a spoonful of crumbled blue cheese or a drizzle of truffle oil.
Variations
- Apple-Black Walnut: Add 1 peeled and diced tart apple (like Granny Smith) along with the onion. The sweetness balances the nuts.
- Pear and Thyme: Add 1 ripe pear, diced, and 1 teaspoon fresh thyme leaves with the garlic.
- Smoky: Use smoked paprika or a pinch of smoked salt instead of regular salt for a deeper, campfire-like note.
- Spicy: Add a pinch of cayenne or a small diced jalapeño with the garlic for a gentle heat.
Storage and Reheating
Refrigerate the soup in an airtight container for up to 4 days. Reheat gently on the stovetop over medium-low heat, stirring frequently. Do not boil, as the cream can curdle. You can also freeze the soup (without the cream) for up to 3 months; add the cream when reheating. Thaw overnight in the refrigerator before reheating.
Frequently Asked Questions
Can I use English walnuts instead? Yes, but the flavor will be much milder and sweeter. The soup will still be good, but it won’t have the distinctive, bold character of black walnuts.
Where can I buy black walnuts? They are often available in specialty grocery stores, online, or at farmers’ markets in the fall. You can also forage them if you have access to a tree, but note that shelling them is labor-intensive and stains hands.
Do I need to soak black walnuts first? No, soaking isn’t necessary for this recipe. Simmering them in stock softens them enough for blending. If your nuts are very dry, you can soak them in hot water for 30 minutes before using.
Can I make this soup in advance? Absolutely. The flavors actually meld and improve after a day in the fridge. Just wait to add the cream until you’re ready to serve, or add it and reheat gently.
Why does my soup taste bitter? Black walnuts naturally have a slight bitterness, but it shouldn’t be overwhelming. If it is, you may have used rancid nuts (they go bad quickly), or you may have burned them during toasting. Try adding a pinch of sugar or a splash of apple cider vinegar to balance the bitterness.
Is this soup gluten-free? Yes, as written, this recipe is naturally gluten-free. Just be sure to use a stock that is certified gluten-free if you have celiac disease.