Mushroom and Leek Broth
A light, elegant French-inspired vegetable broth built on the delicate flavors of mushrooms and leeks, gently simmered with aromatic thyme and peppercorns. This broth is pure, umami-rich, and works beautifully as a refined base for soups, risottos, and sauces, or served simply on its own with crusty bread. The method is straightforward—no roasting or caramelization needed—making it quick and foolproof.
- Prep
- 15 min
- Cook
- 35 min
- Total
- 50 min
- Makes
- About 4 cups (950 ml) of broth
Steps
Before you start
- Have all ingredients prepped and ready before you start simmering—there is no browning step, so you'll go straight into the pot
- Use a 3-quart (2.8-liter) saucepan or small stockpot so the liquid covers the vegetables by about 1 inch
- If using very sandy leeks, cut them lengthwise and rinse thoroughly between the layers
Prep and combine
- In a 3-quart (2.8-liter) saucepan or small stockpot, combine the water, quartered mushrooms, sliced leeks, thyme sprigs, peppercorns, and salt.
- Stir once to distribute the vegetables evenly.
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Tip: Don't crowd the pot—the vegetables should be mostly submerged in water. If they float above the liquid, add a little more water.
Bring to a boil
- Place the pot over medium-high heat and bring to a boil, watching for the surface to bubble actively.
- This should take about 5 minutes.
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Ready when: Liquid reaches a rolling boil with bubbles breaking the surface continuously
Tip: Don't cover the pot while bringing it to a boil—you want to see the bubbles start.
Reduce heat and simmer
- Once boiling, reduce the heat to medium-low so the broth simmers gently with small, steady bubbles rising slowly to the surface.
- Cover the pot partially (tilted lid) to prevent rapid evaporation while allowing steam to escape.
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Tip: A gentle simmer extracts delicate flavor without making the broth cloudy. If it boils too vigorously, the vegetables will break apart and muddy the liquid.
Simmer and infuse
- Simmer uncovered or with the lid tilted for 30 minutes.
- The mushrooms will soften and release their earthy flavor into the broth, and the leeks will become tender.
- After 20 minutes, taste and adjust the salt if needed—remember the broth will concentrate slightly as it simmers.
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Ready when: Mushrooms are very soft and beginning to break apart slightly; broth smells deeply of mushrooms and leeks
Tip: Taste at the 20-minute mark so you can adjust salt with time to spare. Broth flavor develops as vegetables soften, not after they disintegrate.
Strain the broth
- Place a fine-mesh sieve over a heatproof bowl or large measuring cup.
- Carefully pour the broth through the sieve, using a spoon to gently press the softened vegetables against the sides of the sieve to extract all liquid.
- You should have approximately 4 cups (950 ml) of clear, amber broth.
- Discard the solids.
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Ready when: Broth is clear and all solids are separated
Tip: Don't press too hard or the broth will become cloudy. A light press is enough to release the flavorful liquid without pushing fiber and pulp through the sieve.
Final taste and serve
- Pour the broth back into the saucepan if you plan to use it right away, or into a storage container.
- Taste once more and adjust salt and pepper to your preference.
- Serve hot in warmed bowls, or store for later use.
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Tip: If you're serving immediately, warm the bowls under hot running water or in a warm oven—cold bowls cool the broth quickly.
Good to know
Tips
- This broth is a flavor base, not a clear consommé. Don't expect crystal clarity—some gentle cloudiness is normal and harmless. If you want pristine clarity, line your sieve with a single layer of cheesecloth and pour slowly without pressing.
- Cremini mushrooms (baby bellas) have more flavor than white button mushrooms. If you have access to them, they're worth the small premium in price.
- For a richer broth, add a small piece of Parmesan rind (about 1 ounce / 30 g) in step 1. Remove it when you strain. This deepens the umami without making the broth creamy.
- This broth freezes beautifully in ice cube trays—pop out the cubes once frozen and store in freezer bags. Perfect for deglazing pans or enriching quick soups.
Make ahead
Yes. Make the broth up to 3 days in advance. Cool it completely, then refrigerate covered. You can also freeze it for up to 3 months in airtight containers or ice cube trays for portion control.
Storage & reheating
Room temperature: 1 hour maximum (discard after); Refrigerator: up to 3 days in an airtight container; Freezer: up to 3 months in airtight containers or ice cube trays. To reheat: Thaw if frozen, then warm gently on the stovetop over medium heat or in the microwave, covered, stirring occasionally. Do not boil—gentle heating preserves delicate flavor.
Substitutions
- cremini or button mushrooms → Mixed mushrooms (cremini, oyster, shiitake stems). Use the same total weight. Shiitake and oyster mushrooms add deeper umami; shiitake stems (cleaned) are economical and flavorful.
- leeks (white and light green parts) → 2 large onions (yellow or white), halved and sliced. Onions create a sweeter, less delicate broth. Use the same weight. This works well if you prefer a more robust flavor.
- fresh thyme sprigs → 2 bay leaves or 3 parsley sprigs. Bay leaves are stronger; parsley is milder. Both work, but thyme's earthiness pairs best with mushrooms.
- whole black peppercorns → 4–5 grinds of fresh black pepper, added at the end. Whole peppercorns infuse more subtly over time. Ground pepper can become harsh if simmered, so add it after straining instead.
