Natural form

A whole fennel bulb with stalks and feathery fronds still attached, showing its full structure.

Shows the reader the complete plant as found at market — pale layered bulb, ridged stalks, and delicate fronds — so the ingredient is immediately recognizable in any form.

Produce

Fennel Bulb

Crisp white bulb with a sweet anise flavor, eaten raw, braised or roasted.

Fennel bulb is the swollen base of the fennel plant, with a pale, layered structure and a sweet, licorice-like anise flavor. It is sliced thin and shaved raw into salads, or braised, roasted and caramelized to mellow its flavor in Mediterranean cooking. The feathery fronds are used as an herb garnish.

Fennel bulb (Foeniculum vulgare var. azoricum) is a Mediterranean vegetable selected and cultivated over centuries for its enlarged, succulent leaf base—a swollen petiole, not a true root or tuber. This distinction matters in the kitchen: the high water content that makes it crisp when raw also means it turns mushy if overcooked, so timing is everything. The entire plant is edible—the bulb as a vegetable, the hollow stalks as a flavoring agent, the feathery fronds as a finishing herb, and the seeds as a spice—but it is the ivory-white bulb that most cooks seek. Its flavor is sweet and aromatic with a distinctive anise or licorice note, milder than actual anise seed, with a texture that shifts from crunchy-raw to silky-cooked. Fennel belongs to the Apiaceae family alongside carrots, parsley, and dill, which explains its aromatic kinship with these ingredients. In Italian, Provençal, and Spanish cooking it is a foundational vegetable: raw it provides brightness and crunch; cooked, it mellows into something almost caramelized and savory, a transformation that rewards patient roasting or braising.

Measured in: piece
Storage: Fridge

Types & varieties

Florence Fennel (Finocchio)

The standard bulb fennel; most common in markets. Compact white bulb with crisp texture and pronounced anise flavor.

Carmo Fennel

A hybrid variety bred for uniform bulb shape and high yield; common in commercial production.

Romanesco Fennel

Italian heirloom with particularly sweet flavor and dense bulb; favored by chefs.

Bronze Fennel

Grown primarily for its ornamental copper-bronze foliage and seeds; bulb is smaller and less developed.

Anatomy of a Fennel Bulb

Understanding the structure helps you use the whole vegetable efficiently. The bulb consists of tightly overlapping leaf bases arranged in concentric layers around a central core. The outer layers are the firmest and most fibrous; the inner core is the tenderest but also the slowest to cook because it is denser. The fronds emerge from the top and are finely divided like dill. The stalks are hollow and connect to the bulb base. When you buy fennel, you typically receive the bulb with a short section of stalk still attached and the fronds intact—use them all.

Bulb: Primary edible portion; slice, dice, or roast whole
Core: Edible but denser; score deeply when cooking whole to ensure even tenderizing
Stalks: Hollow; retain for stocks or use as a bed for roasting fish
Fronds: Delicate herb-like finish; chop and scatter over finished dishes just like dill

Choosing and Storing Fennel

Select bulbs that feel heavy for their size—density indicates high water content and freshness. The bulb should be firm and compact with no signs of splitting or browning on the outer layers. Avoid bulbs that feel light or puffy, as this signals a woody, dried-out core. The fronds should be bright green and perky, not wilted. Once home, store unwashed in a loose plastic bag in the refrigerator's crisper drawer for up to a week. Wash and trim just before use. If you need to hold cut fennel, store it cut-side down on a plate to prevent moisture from pooling in the core, which promotes softening.

Heavy for size = fresh; light and puffy = woody core
Bright green fronds indicate freshness
Refrigerate unwashed; trim and wash just before using
Cut-side down storage prevents core softening

Common uses

Raw shaved thin in salads with citrus, olive oil, and Parmesan for a classic Italian appetizerBlended into creamy soups or added to potato-leek soup for subtle anise depthBraised in white wine, butter, and aromatics until silky and sweetQuartered and roasted with olive oil until caramelized and nuttyGrilled in thick slices until charred and softStuffed into whole fish like branzino or into pork roastsSautéed as a side dish with onion and garlicFolded into risotto or pasta for aromatic backboneQuickly pickled in vinegar, sugar, and salt as a condimentAdded to court bouillons and stocks for subtle background flavorGarnished with chopped fronds over soups and finished dishes

Tips & pitfalls

Slice from the bottom upward toward the fronds to maintain the bulb's structure for roasting or grilling whole
Always remove the outer layer if it shows any browning, dryness, or tough texture before cooking
For raw applications, slice paper-thin on a mandoline—the texture difference between thick and thin slices is substantial
Do not discard the fronds; they are edible and work as a finishing herb like dill or tarragon
The hollow stalks can be retained and used as a subtle flavoring in stocks or as a bed for roasting
To mellow the anise flavor for sensitive eaters, briefly blanch slices in boiling water for 30 seconds, then shock in ice water
When buying, select dense, compact bulbs that feel heavy for their size—light, puffy bulbs indicate woody or dried-out cores
For braising, add a splash of Pernod or pastis to the liquid to reinforce the fennel flavor without adding sharpness
The core is edible but cooks more slowly; score it with a cross to help it soften evenly
Sliced fennel oxidizes quickly but this has negligible effect on flavor or appearance; a squeeze of lemon can slow browning if serving raw for presentation purposes

Nutrition

31kcal

Energy

130 kJ · per 100 g

Where the calories come from

Protein 14%Carbs 81%Fat 5%

Protein

1.2g

2% DV

Carbs

7.3g

3% DV

Fat

0.2g

0% DV

Fiber

3.1g

11% DV

Sugars

3.9g

of which

Sodium

52mg

2% DV

Notable micronutrients

Vitamin K52% DV

Vitamin C13% DV

Potassium9% DV

Folate7% DV

Vitamin A5% DV

Vitamin E4% DV

Source · USDA FoodData Central · Fennel, bulb, raw

View on FDC →

In the shops

Matched grocery products

Green Celery
660 g · Mercadona
€1.32
Cut and Washed Celery
210 g · Mercadona
€1.15
Organic Celery in Bag
kg · Bonpreu
€2.19
Celery Sticks 200g bag
LA COLLITA · kg · Bonpreu
€1.15
LA COLLITA Celery Km0 1 unit
LA COLLITA · kg · Bonpreu
€1.89
Cut Celery Km0 in a 400g Bag
LA COLLITA · kg · Bonpreu
€1.95

Good to know

Scientific Name: Foeniculum vulgare var. azoricum (Florence fennel)
Origin: Mediterranean basin, cultivated since ancient Rome
Peak Season: Fall through early spring; available year-round in mild climates
Flavor Profile: Sweet anise/liquorice, mildly woody, slightly celery-like
Edible Parts: Bulb (primary), stalks, fronds (feathery greens), seeds
Storage: Refrigerate unwashed in a plastic bag for up to 7–10 days
Yield: Approximately 70–80% edible after trimming outer layers
Typical Size: 3–6 inches in diameter; golf ball to large grapefruit
Preparation Time: 5–10 minutes to clean and slice
Equipment: Sharp knife, mandoline (optional for thin slicing)
Difficulty: Easy; requires basic knife skills

Substitutes

Celery — Best for texture in salads; lacks anise flavor but provides similar crunch. Use 1:1 ratio.
Anise Seed — For flavor matching only; not a textural substitute. Use a pinch of seeds to approximate one bulb's flavor contribution.
Sweet Onion — Partial substitute for cooked applications where the anise note is background. Lacks the distinctive flavor entirely.
Jicama — Provides similar crunch for raw uses; neutral flavor lets other ingredients dominate. Use 1:1 ratio.

Pairs with

Citrus (orange, lemon, grapefruit)Olive Oil Fish (salmon, sea bass, shellfish)PorkApple and PearParmesan GarlicPernod, Pastis, or SambucaButter Breadcrumbs White Wine

Also called

Florence Fennel · Finocchio