Whole roasted onions are soft, aromatic, and so delicious that they become a stand-alone side dish! This recipe and these tips will give you perfect baked onions every single time.
Here’s how this is going to go down, my friends: whole roasted onions, roasted with olive oil and butter, roasted with rosemary, roasted whole, roasted to sweet submission.
It’s cold. I mean… really cold. Here’s our chance to crank up the oven, throw these onions inside and lean against the oven door as they transform from sharp and bite-y to soft and sweet. And while we’re at it, here’s how to roast any vegetable.
Oh wait… you might be one of those people who think they don’t like onions. I’m here to tell you that you’re wrong. You exclusively like whole roasted onions.
If you’re feeling fancy you might want to try this recipe for Ottolenghi’s Miso Butter Roasted Onions and Garlic! It’s like a savory onion candy. 10/10 recommend.
What Are Roasted Onions?
This recipe is just like it sounds. You season and bake whole onions with slices of real butter on top. Roasting them softens the onions and brings out their natural sweetness. If you aren’t a fan of the bold tartness of onions, roasting them cuts the bold flavors back and makes them easier on your palette.
Best Types Of Onions To Bake
When it comes to roasting or baking onions, use white onions or yellow onions. They will retain their shape and texture the best. Plus, both varieties have a bolder flavor that sweetens beautifully when you bake them slowly.
How To Use Roasted Onions
The best way to enjoy roasted onions is to slice them and eat them as a side dish along with some fluffy mashed potatoes. You could also roast the onions and then add a few slices on top of some baked sweet potatoes or top of your favorite salad.
The best thing about cooking is how much control you have over the way your food turns out! If you change my recipe, let me know. I’d love to hear what you did (and maybe I’ll try it that way).
Fresh rosemary is the best herb to roast with onions, but try it with fresh sprigs of thyme. It’s an earthy and sweet herb that will bring out the buttery notes in the onions.
Drizzle balsamic vinegar on top of the onions right before you bake them. As the onions caramelize, the vinegar will break the onions down even more and release more sugar, giving you tangy-sweet onions in the end.
Quarter or slice the onions first. The smaller the onions are, the quicker they will bake, so keep an eye on the oven.
How To Roast Onions In The Air Fryer
Roasting is magic. It’s as simple as that, but you don’t have to heat up the entire kitchen just to roast a few onions (I’m looking at you, summertime humidity).
To roast onions in the air fryer, follow the same instructions in the recipe card. Place the onions in the air fryer basket. Set it to 375F and air fry them for 20 minutes. If they aren’t done to your liking, roast for another 10 minutes.
These roasted onions tops removed and toasted in their jackets become soft, smooth, sweet, and almost spreadable. I served mine alongside thin-cut pork chops and salad because I’m good at living.
Honestly, whole roasted onions taste the best when they are fresh out of the oven. You can store leftovers in an airtight container in the refrigerator for up to three days. Just know that they will become softer, and their flavor will change. It just isn’t the same. Eat them fresh, trust me.
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