Light Brothy Soup with Vegetables and Herbs

Light brothy soup is a clear, gently flavored soup of tender vegetables, small pasta, and fresh herbs simmered in a savory broth. This flexible, Italian-inspired version is satisfying without feeling heavy, and a squeeze of lemon at the end keeps the flavors bright.

Ingredients

1 tablespoon (15 ml) extra-virgin olive oil
1 medium yellow onion, finely diced, about 1 cup (150 g)
2 medium carrots, diced, about 1 cup (130 g)
2 celery ribs, diced, about 1 cup (100 g)
2 garlic cloves, minced, about 2 teaspoons (6 g)
6 cups (1.4 L) low-sodium vegetable broth or chicken broth
1 small zucchini, diced, about 1½ cups (200 g)
½ cup (70 g) small pasta, such as orzo or ditalini
1 cup (30 g) baby spinach, roughly chopped
1 teaspoon (1 g) finely grated lemon zest
1 tablespoon (15 ml) fresh lemon juice, plus more to taste
2 tablespoons (8 g) chopped fresh flat-leaf parsley
½ teaspoon fine salt, plus more to taste
¼ teaspoon freshly ground black pepper
Optional: 2 tablespoons (10 g) finely grated Parmesan, for serving

Instructions

Prepare the vegetables. Dice the onion, carrots, celery, and zucchini into small, fairly even pieces so they cook at about the same rate. Mince the garlic and chop the parsley. Keep the spinach, lemon, and pasta ready to add later.
Soften the aromatics. Warm the olive oil in a large pot or Dutch oven over medium heat. Add the onion, carrots, celery, salt, and pepper. Cook for 6–7 minutes, stirring occasionally, until the onion is translucent and the vegetables begin to soften. They should not brown deeply; lower the heat if they start to stick.
Add garlic and broth. Stir in the garlic and cook for 30 seconds, just until fragrant. Pour in the broth and add the zucchini. Bring the soup to a gentle boil, then reduce the heat to maintain a steady simmer. Cook for 5 minutes, until the carrots are nearly tender.
Cook the pasta in the soup. Stir in the pasta and simmer according to its package directions, usually 7–9 minutes, until just al dente. Stir once or twice to prevent sticking. Keep the pot uncovered so the broth does not boil over. If the pasta absorbs more liquid than expected, add a little hot water or broth.
Finish and season. Stir in the spinach and cook for 1–2 minutes, until wilted. Turn off the heat, then add the lemon zest, lemon juice, and parsley. Taste and adjust salt, pepper, and lemon juice. Ladle into bowls and add Parmesan if desired.

Tips

Keep the broth gentle. A lively simmer cooks the vegetables evenly while keeping the broth clear. A hard boil can break up tender vegetables and make the pasta release extra starch.
Check broth saltiness before seasoning. Broths vary considerably. The recipe starts with a modest amount of salt; taste near the end and add more only if needed.
Use sturdy greens if needed. Baby kale or chopped Swiss chard can replace spinach. Add kale with the zucchini so it has time to soften; chard stems can go in with the carrots and leaves near the end.
Prevent soggy pasta in leftovers. Pasta continues absorbing broth as the soup sits. For soup you expect to store, cook the pasta separately and add it to each bowl, or accept that you may need extra broth when reheating.

Serving Suggestions

Serve the soup hot as a light lunch or a first course, with crusty bread, toast, or simple crackers for dipping. A small green salad with a sharp vinaigrette makes a fresh accompaniment. For a more substantial bowl, finish with Parmesan and a drizzle of good olive oil; keep those additions modest if you want the broth to remain the focus. Offer lemon wedges at the table so each person can brighten their serving to taste.

Variations

Make it gluten-free: Use a small gluten-free pasta and check the broth label. Gluten-free pasta can soften quickly, so cook it separately and add it just before serving.

Swap the pasta: Use ½ cup (90 g) cooked white beans or chickpeas instead. Add them with the zucchini and simmer until hot. This changes the texture and makes the soup more filling. You can also use ½ cup (90 g) cooked rice, adding it with the spinach so it does not overcook.

Use seasonal vegetables: Replace zucchini with 1 cup (120 g) diced green beans, adding them with the broth, or use 1 cup (100 g) thinly sliced fennel in place of some celery. Fennel lends a mild anise note.

Add a little heat: Add a pinch of red pepper flakes with the garlic. For a more savory finish, stir in 1 teaspoon (5 ml) soy sauce, tasting before adding extra salt.

Storage and Reheating

Cool the soup promptly and refrigerate it in a covered, shallow container within 2 hours of cooking. Store for 3–4 days. Reheat only the portion you need in a saucepan over medium heat, stirring occasionally, until steaming throughout; leftovers should reach 165°F (74°C) when checked with a food thermometer. Add a splash of broth or water if the pasta has thickened the soup. You can freeze the broth and vegetables for up to 2–3 months for best quality, but pasta may turn soft; freeze without pasta when possible, then cook and add fresh pasta after thawing. Thaw frozen soup in the refrigerator before reheating.

Frequently Asked Questions

Can I make this soup ahead?
Yes. For the best texture, prepare the broth and vegetables ahead, refrigerate within 2 hours, and cook the pasta separately. Reheat the soup, then add the pasta and spinach just before serving. This keeps the noodles from soaking up too much broth.

Can I use water instead of broth?
You can, but the soup will taste milder. Use water only if you can season it well; add extra herbs, a little more salt as needed, and Parmesan at the table for savory depth. Avoid adding all the extra salt at once—taste first.

What pasta works best?
Orzo, ditalini, small shells, and tiny macaroni all work. Choose pasta that fits easily on a spoon and follow its package cooking time. If using a larger shape, break it into small pieces only if appropriate, or cook it separately and portion it into bowls.

How can I make the soup vegetarian?
Use vegetable broth and skip the Parmesan, or choose a vegetarian hard cheese. Check packaged broth and cheese labels if you need to avoid particular ingredients; products can vary.

Why does my soup have less broth the next day?
The pasta keeps absorbing liquid as it rests, especially when stored in the soup. Stir in a little water or broth while reheating and adjust the seasoning afterward, since added liquid can dilute the flavor.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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