Instead · 1
onion
one medium onion per large leek
- What it gets you
- The same allium base with more sweetness and better browning.
- What it costs you
- The silkiness. Leeks go soft and creamy in a way onion never quite does.
Substitutions · 7 dishes here use it
Out of leek
The gentlest allium — sweet and silky when cooked slowly in fat. It also carries grit between the layers, so it wants splitting and washing properly before it goes anywhere.
Everything below is judged against that job. A swap that covers it is a swap; one that only looks similar is not.
Functional substitution system
Replace the job, then correct the side effects
For leek, the page's working definition is: The gentlest allium — sweet and silky when cooked slowly in fat. It also carries grit between the layers, so it wants splitting and washing properly before it goes anywhere. The swap cards below are judged against that job rather than visual resemblance.
1 · Job
What is the missing ingredient doing?
2 · Candidate
Choose the shelf item that replaces that function.
3 · Side effects
Check water, fat, salt, acid, sweetness, and texture.
4 · Small test
Change a spoonful or small portion first when possible.
5 · Correct
Taste again and move only the axis that is still wrong.
What to reach for
Instead · 2
scallion whites, or a bunch of scallions
a whole bunch per leek
- What it gets you
- A mild allium that softens in two minutes rather than fifteen.
- What it costs you
- Body and sweetness. A leek soup made with them is thin.
Instead · 3
fennel bulb
one for one
- What it gets you
- A vegetable that braises to the same silky softness in the same gratins and soups.
- What it costs you
- The allium note, replaced by anise, which suits fish and pork and argues with a vichyssoise.
Where the swap will be tasted · 5
These need it and are short enough that nothing hides: 4 required ingredients or fewer. Make the swap a decision rather than a repair.
Check what else is in the pan
The company leek keeps in this library, counted off required ingredients. A swap that argues with the top two is the wrong swap, whatever a chart says.