How to Roast Vegetables: Golden, Crisp and Full of Flavour

5 days ago

3 min read

Roasting is the easiest way to change the mind of anyone who says they don't like vegetables. A hot oven turns carrots sweet, sprouts nutty and broccoli crisp at the edges. You need one tray, a little oil and a few simple rules.

Why It Matters

In a hot oven, the natural sugars in vegetables caramelise and their surfaces brown: the same browning that makes a seared steak taste so good, which you'll know from my How to Sear Meat lesson. Boiling can't do that. Once you can roast one vegetable, you can roast them all, and side dishes take care of themselves.

What You Need

A rimmed baking sheet, the bigger the better.
Oil with a high smoke point, such as olive, avocado or canola oil.
Salt and pepper.
Parchment paper if you want easy washing up. Vegetables brown a little less on parchment than on a bare tray.

The Six Rules

Heat the oven to 425°F (220°C). Any lower and the vegetables steam before they brown.
Dry them. Wash, then dry your vegetables well. Water on the surface turns to steam and stops browning.
Cut evenly. Pieces of the same size cook at the same speed. About 1 inch (2.5 cm) is right for most vegetables.
Oil and season. Toss with just enough oil to coat, roughly 1 tablespoon per pound (450 g), then season with salt and pepper.
Give them space. Spread them in a single layer with gaps between the pieces. A crowded tray steams, so use two trays if you need to.
Turn once. Roast until the undersides are golden, then turn them over and roast until tender and browned.

Roasting Times at 425°F (220°C)

Asparagus, green beans, cherry tomatoes: 10 to 15 minutes
Broccoli and cauliflower florets, peppers, courgettes (zucchini), mushrooms: 20 to 25 minutes
Brussels sprouts, halved: 20 to 30 minutes
Onion wedges: 25 to 35 minutes
Potatoes, carrots, parsnips, sweet potatoes and butternut squash, in 1 inch (2.5 cm) pieces: 30 to 45 minutes

Mixing vegetables? Start the slow ones first and add the quick ones later, so everything finishes together.

How to Tell It's Right

Golden-brown edges, a few darker caramelised spots, and a knife slides into the thickest piece easily. Taste one: it should be sweet and tender inside, with a little crunch outside.

What Can Go Wrong

Soggy and pale: the tray was crowded, the vegetables were wet, or the oven wasn't hot enough.
Burnt outside, hard inside: the pieces were too big. Cut them smaller or lower the heat to 400°F (200°C).
Some burnt, some raw: the pieces were different sizes. Cut evenly, or roast different vegetables on separate trays.
Burnt garlic or herbs: add chopped garlic and soft herbs in the last 10 minutes, or toss them through at the end.
Bland: season before roasting, then finish with a squeeze of lemon, flaky salt or a little grated Parmesan.