The right pan to roast vegetables
Quick answer
To roast vegetables, use a bare or anodised aluminium half sheet pan, 18 by 13 inches. Bare aluminium browns more evenly than anything else at the price, and a single layer with space around each piece is what produces colour.
The material properties are published. Which material suits which job is reasoned from those properties and from common kitchen practice.
| Material | Conductivity | Heat retention | Reactive | Suits this job |
|---|---|---|---|---|
| Tri-ply stainless clad | 237 W/m-K aluminium core, 16 at the surface | medium | No | Workable, with compromises |
| Bare cast iron | 52 W/m-K | very high, because of mass rather than conductivity | Yes | Workable, with compromises |
| Carbon steel | 50 W/m-K | medium, well below cast iron because it is much thinner | Yes | Workable, with compromises |
| Enamelled cast iron | 52 W/m-K iron body | very high | No | Workable, with compromises |
| PTFE nonstick | 237 W/m-K aluminium body | low | No | Workable, with compromises |
| Bare or anodised aluminium | 237 W/m-K | low | Yes | Best choice |
| Lined copper | 401 W/m-K copper body, 16 at the surface | medium | No | Workable, with compromises |
| Plain stainless steel | 16 W/m-K | low | No | Workable, with compromises |
Nordic Ware Naturals Quarter Sheet, 2-Pack, Natural
Why bare or anodised aluminium for this?
Bare aluminium browns more evenly than anything else at the price, and a single layer with space around each piece is what produces colour.
Bare or anodised aluminium conducts heat at about 237 W/m-K, and its heat retention is low. Aluminium conducts about fifteen times better than stainless, which is why almost every good stainless pan has aluminium hidden inside it.
Why size matters as much as material
An 18 inch sheet pan is a half sheet, 18 by 13 inches, giving 234 square inches of flat surface. It is the largest size that reliably fits a domestic oven, and vegetables need to sit in a single layer with space around each piece to brown.
Crowding is the most common way this job goes wrong. Food releases moisture, and if there is not enough surface for that moisture to evaporate it pools and the food steams at roughly the boiling point of water instead of browning. Turning the heat up does not fix it, because the limit is evaporation rate rather than energy input.
What else will work, and what it costs you
Most of the other common materials will do this job to some degree, with a specific compromise each time. A thin conductive pan responds faster and loses temperature the moment cold food lands. A thick iron pan holds temperature and is slow to react when you want to pull the heat back. A coated pan releases food reliably and cannot be run at searing temperatures. The table above marks the ones to avoid for this job outright.
One genuine constraint with this material: Bare aluminium reacts with acidic and strongly alkaline food, which can discolour both the pan and the food. Anodising largely removes this. Induction: it does not work on induction. Aluminium is not ferromagnetic, so an induction hob cannot couple to it at all unless a steel plate is bonded on.
Pans to roast vegetables
- Nordic Ware
Nordic Ware Prism Baking Quarter Sheet, Natural
Under $25 Check priceBudget band; Amazon shows the current price - Nordic Ware
Nordic Ware Naturals Quarter Sheet with Oven-Safe Nonstick Grid
Under $25 Check priceBudget band; Amazon shows the current price - Nordic Ware
Nordic Ware - 43172AMZM Nordic Ware Half Sheet with Oven Safe Nonstick Grid, 2 Piece Set, Natural
2 piecesUnder $25 Check priceBudget band; Amazon shows the current price
Common questions
What is the best pan to roast vegetables?
A bare or anodised aluminium half sheet pan, 18 by 13 inches. Bare aluminium browns more evenly than anything else at the price, and a single layer with space around each piece is what produces colour. Size matters as much as material here, because crowding causes more failed results than the wrong metal does.
Can I use a different material?
Yes, with a known compromise. Bare or anodised aluminium is chosen here because bare aluminium browns more evenly than anything else at the price, and a single layer with space around each piece is what produces colour. Other materials will cook the food safely and will change the result: a thinner pan loses heat faster, a coated one cannot be run as hot, and a reactive one limits how long acidic ingredients can cook.
What size should the pan be?
A half sheet. An 18 inch sheet pan is a half sheet, 18 by 13 inches, giving 234 square inches of flat surface. It is the largest size that reliably fits a domestic oven, and vegetables need to sit in a single layer with space around each piece to brown.
Does this work on induction?
No. Aluminium is not ferromagnetic, so an induction hob cannot couple to it at all unless a steel plate is bonded on. A fridge magnet on the base settles it definitively: a firm grip across the whole base means it will work, a grip only in the centre means uneven heating, and no grip means it will not heat at all.
How hot can this pan go?
The material is good to about 500F. Uncoated aluminium bakeware handles normal baking and roasting temperatures without trouble. A nonstick coating on it, not the metal, is what sets a lower limit. The real ceiling for any assembled pan is the lowest of its cooking surface, its handle and, when covered, its lid, and the handle is very often the lowest of the three.
