Lemony Leek & Mushroom Soup

A clean, vegetable-forward soup that earns the “lemony” in its name by using the dark green tops of leeks (usually trashed) to build a quick stock, then finishing the whole pot with the juice of a fresh lemon. Brighter and lighter than your typical mushroom soup, and well-suited for the Passover table since it’s naturally vegan and Kosher-friendly.

The two-stage approach is the secret. Most weeknight soup recipes skip the homemade stock step, but here it’s quick (30 minutes simmer) and dramatically deepens the flavor. The dark leek tops, herb stems, and a couple of bouillon cubes do the work.

The overnight rest is the other technique worth honoring. Refrigerating overnight and reheating the next day mellows the turnips, lets the bay leaves develop, and tightens the broth. Same-day eating is fine; next-day eating is better.

The lemon goes in at the very end, off heat. Cook lemon juice in a soup and the bright top-note flavor vanishes; add it raw at serving and it pops.

Fresh dill (not dried) is the right call. Dried dill tastes like green dust by comparison.

Pro Tips

• Wash leeks ruthlessly. Slit them lengthwise and rinse between the layers; they hold sand from the field that ruins a clean soup.
• White mushrooms are fine but cremini or baby bellas give a deeper, more savory mushroom flavor.
• For Passover, top with matzo farfel (broken matzo) as the recipe suggests. Outside of Passover, croutons or a swirl of olive oil work well.
• Make a big batch. This freezes well for up to 3 months in airtight containers.

Variations

• Add a cup of cooked white beans or chickpeas for more protein.
• Stir in a handful of baby spinach at the end for color and an extra leafy note.
• Replace some water with white wine for a richer, slightly more elegant broth.