Fennel Frond and White Bean Soup

A comforting white bean soup that uses both the fennel bulb and its fronds, with the fronds stirred in near the end to preserve their flavor.

Fennel Frond and White Bean Soup

This soup is a good example of using fennel fronds as a real ingredient in a cooked dish rather than only in cold, fresh applications - stirred in near the end of cooking, similar to how a more delicate herb gets added late so its flavor doesn't cook away.

Fennel Frond and White Bean Soup

Prep time: 10 minutes | Cook time: 30 minutes | Serves: 4

Ingredients

  • 3 tbsp olive oil
  • 1 onion, diced
  • 1 fennel bulb, diced (fronds reserved separately)
  • 2 garlic cloves, minced
  • 4 cups vegetable or chicken broth
  • 2 (15 oz) cans white beans, drained and rinsed
  • 1/2 cup fennel fronds, roughly chopped
  • 1 tbsp lemon juice
  • Salt and black pepper, to taste
  • Grated Parmesan, for serving (optional)

Instructions

  1. In a large pot, heat the olive oil over medium heat. Add the onion and diced fennel bulb, and cook for 6 to 8 minutes until softened.
  2. Add the garlic and cook for another minute until fragrant.
  3. Pour in the broth and add the white beans. Bring to a simmer and cook for 15 minutes.
  4. For a partially thickened texture, blend about a third of the soup with an immersion blender directly in the pot, or skip this step for a fully brothy, chunky soup.
  5. Stir in the chopped fennel fronds and lemon juice, and simmer for another 2 to 3 minutes - just enough to soften the fronds slightly without cooking away all their flavor.
  6. Season with salt and pepper. Serve hot, topped with grated Parmesan if using.

Notes

This soup keeps well in the fridge for up to 5 days and freezes well too, though it's best to add a fresh handful of fronds when reheating a frozen batch, since the flavor fades somewhat over time in the freezer.

Why the Fronds Go in Late

Adding the fronds only in the last few minutes of cooking keeps their fresh, bright flavor intact rather than letting it cook away over a longer simmer - the same principle behind adding a delicate herb like tarragon near the end of a dish rather than at the start.

What to Serve With It

Crusty bread is the natural accompaniment for mopping up the broth. A drizzle of fennel frond oil over the top right before serving adds an extra layer of the same flavor and a nice visual finish.

Variations

  • Add greens: Stir in a handful of chopped kale or spinach along with the fronds for added nutrition.
  • Add sausage: Brown some sliced Italian sausage at the start for a heartier, meatier version.
  • Fully smooth: Blend the entire soup for a creamy, smooth texture rather than a chunky one.

For more ways to use fronds in cooked dishes, see the complete fennel fronds guide.