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I have heard that roasted vegetables are more tasty than steamed, but I have never been successful in roasting in small batches.

What is the best temperature to roast and for how long? Should I add olive oil? How much?

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  • 2
    Which vegetables were you trying and how did you do it @HersheA? What specifically went wrong? What vegetables would you like to roast?
    – GdD
    Sep 11, 2018 at 7:17
  • related: cooking.stackexchange.com/q/18168/67
    – Joe
    Sep 11, 2018 at 12:03

5 Answers 5

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Preheat your oven to 425F (218 C). Squashes and root vegetables will take about 45 minutes at this temperature. Mushrooms, cauliflower, broccoli, and brussles sprouts will cook in about 25 minutes. Cut your vegetables into evenly sized pieces. Place in one layer on a baking sheet (parchment lined is good for browning and easier cleanup). Drizzle generously with olive oil. Season with salt and pepper. Roast. Turn the vegetables over halfway through the cook so that they brown evenly. This information, with pictures, can be found here.

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Yes, roasting vegetables has more flavor than boiling or steaming, because the higher heat will cause browning, which creates additional flavorful compounds in the food. You also reduce the moisture in the vegetables, which will concentrate the flavors, and you don't risk washing away water-soluble flavors as happens with boiling/simmering.

But as this came from the parenting site, I don't know if you necessarily want this to be too flavorful, if you have picky eaters, or you're intending this to be pureed into baby food.

I don't know if there's a truly "best" way of roasting vegetables. If you're cooking from raw, you need to roast at a lower temperature, so that the inside is cooked through before the outside gets burned.

You can also adjust this by how you cut up for vegetables; the smaller they are, the faster they'll cook. But don't go for too small of a dice, or it's more finicky to cook. You're better off with thinner slabs to cook things quickly, although I'd also make it bite sized for the smallest mouth at the table.

I agreed with moscafj about oiling your vegetables, but I'd recommend that you mix the vegetables in a bowl before spreading it on a sheet pan. It's just easier to make sure that everything is well coated without making a mess. (and if you have children, this is a task that they can do). You can use a slotted spoon so you don't end up with an oil slick under the vegetables if you've added too much. I also take the opportunity to season the vegetables in the bowl; I typically add some herbs and a splash of vinegar along with the oil and a few pinches of salt.

Spread the vegetables out in a single layer, but you'll also want to make sure that they're not crowded -- there should be some space between then, not packed in tightly.

Because of the 'bite sized' issue, and firmer vegetables (carrots, winter squash, potatoes, sweet potatoes, etc.) take longer to cook, you may want to start some vegetables before others; start with them, then add peppers, onions, summer squash, etc. about half way through after you've flipped over the firmer vegetables. (exact time depends on how large they're cut up; check recipes online for a starting guideline).

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And then there's another trick ... You can simmer potatoes and other firm starchy vegetables until they're just cooked through (but not soggy), drain them, put them in the bowl (or back in the pot), and knock them against each other before oiling and seasoning. This will rough up the outside, creating more surface area so it crisps up more. And they'll then cook in a similar time to the other vegetables.

You can also pre-heat the sheet pan, so you'll get a little bit of extra browning and possibly avoid needing to flip the vegetables when they're cut fairly small.

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So, to summarize:

  • pre-heat oven (optionally, pre-heat the pan)
  • Cut up vegetables into bite-sized bits
  • (optional) simmer, drain, and rough up potatoes or other firm, starchy vegetables
  • Toss the vegetables together in oil, salt, and any other seasonings
  • Spread the vegetables out on the sheet pan in a single layer, with some space in between them
  • Roast
  • Flip the vegetables over (optionally, add softer vegetables now)
  • (optional) flip over the vegetables added later
  • Remove from oven once nicely browned and cooked through.
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In addition to the great answers here, I would add some tricks I've learned experimenting with roasted veggies:

-pre-steam veggies before you roast them. this is especially helpful for thicker and denser veggies like some cruciferous (broccoli) and root (potatoes) veggies. this helps start the cooking process and reduce the roasting time so you can have thoroughly cooked veggies before they get too brown or burnt and lose all their moisture.

-mix your veggies with the oil and seasonings for better distribution, don't simply brush and sprinkle on top.

-use a baking sheet and rack combo like this one that allows warm air to flow around the veggies on all sides. this is not only more effective than straight on the pan, but it also removes the (annoying) extra step of flipping your veggies part way through!

-roasted veggies taste best right out of the oven, but we're all busy, so how can we speed up the process? prep a bunch of veggies ahead of time (washing, chopping, etc.), store in the fridge, then flavor and cook when you're ready to eat!

The best tool I've found is the Anova steam oven where you can set up a recipe workflow that will preheat pans, steam, and brown with a click of a button on your phone.

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I personally find grilled vegetables to be more to my taste. I also like my vegetables more firm, so grilling on high heat for only a few minutes works well. If you prefer more thoroughly cooked veggies, you will definitely need to lower the heat and cook longer.

Here are my approximate time tables for a grill @ 550-650 degrees F (roughly 300-350 C):

  • Brussels sprouts 12-15m
  • Broccoli ~10m
  • Asparagus ~8-10 (depending on thickness)
  • Zucchini, other squash 8-10m
  • Bell peppers 8m
  • Onion 6-8m
  • Cherry or grape tomatoes (whole) 4-6m
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Try frying in a pan on your stove, or on your grill if you have one.

Chop/Slice/Dice your vegetables into pieces that seem appealing to you, toss with a bit of olive oil, and fry over medium-high heat.

Let the pan heat up first, then add the olive oil, then the vegetables. Toss in some kosher salt and some fresh ground pepper, and stir. Stir every-so-often to ensure nothing burns, but you do want to develop some brownness which is where a lot of flavor comes from.

After the vegetables have developed a little brownness, or become a little soft, you're done! Usually takes about 10-15 minutes, depending on what you're cooking.

You can even try drizzling with balsamic vinaigrette, or other coatings for an extra tasty side.

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