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    Home » Recipes » Sides, Snacks

    Published: February 28, 2021 | Last Modified: March 4, 2021 by Shruthi Baskaran-Makanju | This post may contain affiliate links. 💬 - No Comments

    Roasted Red Onions

    Dairy Free RecipesGluten Free RecipesNut Free RecipesVegan Recipes
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    Easy roasted red onion recipe that comes together in under 30 minutes! Simply seasoned but packs a flavor punch - great on tacos, sandwiches and salads or just as a snack!
    Jump to Recipe Pin Recipe

    Roasted red onions are such an underrated side to any dish or for meal prep! Baking the onions in the oven gives it a delicious crispy texture packed with flavor, making it a great salad, taco or sandwich topper, or a standalone side! Best yet, it's ready in 30 minutes!

    Close up of plate of roasted red onions with skillet in the background

    This post contains helpful tips and tricks! If you're in a rush, please use the "Jump to Recipe" link!

    This post might contain affiliate links. If you click on those and make a purchase, I earn a small commission at no extra cost to you. As an Amazon Associate I earn from qualifying purchases.

    Jump to:
    • 💭 Why you'll love this recipe
    • 📋 Ingredients and notes
    • 📖 How to make easy roasted red onions
    • 👩🏽‍🍳Top tips and FAQs
    • 🍴 Serving and storage suggestions
    • 📖 Recipe

    💭 Why you'll love this recipe

    • Ready in 30 minutes: This recipe only requires about 5 minutes of active prep time, and comes together in just 30 minutes total!
    • Super versatile: I love adding these roasted red onions to tacos, sandwiches, or salads. They taste great on my fried avocado tacos and on my Korean street toast sandwich!
    • Needs just four ingredients: Can this recipe get any better? Of course, there are a bunch of toppings and seasonings you can add but you really just need onions, neutral cooking oil, salt and pepper for the most crispy and flavorful onions!

    📋 Ingredients and notes

    You'll need a large red onion, about a tablespoon of neutral cooking oil (I use avocado oil) and then salt and pepper.

    Labeled ingredient list - check recipe card for details!

    Notes and Variations

    • Other types of onions: I prefer red onions since they're sweet and caramelize well. I've tried them with mild yellow onions before and they tasted okay, but I preferred the red onions. I recommend not using white or Vidalia onions since they are quite pungent!
    • Types of cooking oil: I prefer avocado oil as a base oil for many recipes because it's neutral flavored and has a high smoke point! You could use olive oil as well, but in that case, I'd suggest lowering your oven temperature to 375F and cooking a bit longer instead of roasting at 400F as written in the recipe. Notes provided in the recipe card!

    📖 How to make easy roasted red onions

    Slice the onion into thin rounds

    Wash and cut off the root edges of the onion, and peel the skin. First, cut the onion into two halves. Then, slice each half into a series of circular onion slices.

    Three panel collage showing how to slice red onions before roasting

    Preheat oven to 400F and season the onion

    Preheat your oven to 400F. Then, lay out the onions in a thin layer in an oven proof baking dish (or better yet, a nice enameled cast iron braiser or skillet!) Drizzle olive oil, and top with salt and pepper. Toss the onion rings and spread them out so they're well seasoned.

    Three panel collage showing how to place onions in skillet and season

    Bake in the oven for 20 minutes

    Place the baking dish in the oven and roast / bake for 10 minutes first. Then take the skillet out carefully using oven mitts, and then toss them a bit more (or flip them).

    Roasted red onions in skillet halfway through the process
    Onions halfway through the roasting process

    You can skip this step and cook the full 20 minutes as well, but I prefer taking them out halfway since I find this browns the two sides evenly! Cook until the onion rings are nicely caramelized, crispy on the outside, but tender to bite. Your roasted red onions are ready!

    Fully roasted red onion at the end of the 20 minutes!

    👩🏽‍🍳Top tips and FAQs

    How can you caramelize the onions faster?

    Adding about half a tablespoon of balsamic vinegar can make the onions caramelize faster because of the sugar content! This makes great balsamic roasted red onions!

    Can I use other onions to make roasted onions?

    I prefer red onions, and mild-flavored yellow onions also work. But I try to avoid white onions and Vidalia onions since I find them quite strong!

    What are the best ways to serve roasted red onions?

    Seriously, this is a great topping for any taco, sandwich, or salad. I've added these to my fried avocado tacos and gochujang cauliflower tacos in lieu of pickled onions, added them to a delicious roasted beet salad and sometimes just eat them straight!

    🍴 Serving and storage suggestions

    Roasted red onions are good in the fridge in an airtight container for at least a couple of days. You can either reheat them in a microwave or if you want to preserve the crispiness, throw them on a skillet to warm up (or add them on top of scrambled eggs!) Sometimes I add them to my crispy kimchi pancakes for a fun, Korean-inspired breakfast!

    If you like this recipe, don't forget to try out my other easy and healthy sides recipes:

    • Vegan Refried Beans (One Pot, Gluten Free!)
    • Pickled Jalapeños (How to Preserve Jalapeños!)
    • Stir Fry Green Beans with Coconut (Beans Poriyal)
    • Flaky Buttermilk Cheddar Cheese Biscuits

    To find out other recipes that are in season, check out my seasonal produce guides!

    Did you make this recipe?! ⭐⭐⭐⭐⭐
    Please leave a comment and a star rating and let me know how it went! We love hearing from you, thank you so much

    📖 Recipe

    Close up of roasted red onions
    Print Recipe
    5 from 1 vote

    Roasted Red Onions

    Easy roasted red onion recipe that comes together in under 30 minutes! Simply seasoned but packs a flavor punch - great on tacos, sandwiches and salads or just as a snack!
    Prep Time5 mins
    Cook Time25 mins
    Total Time30 mins
    Course: Side Dish
    Cuisine: American
    Diet: Gluten Free, Low Calorie, Vegan, Vegetarian
    Servings: 4 servings
    Calories: 44kcal
    Author: Shruthi Baskaran-Makanju

    Ingredients

    • 1 red onion, large, sliced into thin circles
    • 1 tablespoon avocado oil
    • 1 teaspoon kosher salt
    • ½ teaspoon crushed black pepper
    • ½ teaspoon garlic powder

    Instructions

    • Wash and peel one large red onion. Slice off the root edges, and cut them into two halves. Then, slice each half into ¼-inch thick slices. Use your fingers or a fork to separate the slices into thin rings.
    • Preheat the oven to 400°F. While the oven is heating, spread the onion slices / rings evenly, neatly spaced out in an oven-proof baking dish or a cast iron skillet. Toss the slices with avocado oil, and toss to coat. Then, add a teaspoon of salt, and ½ teaspoon each of black pepper and garlic powder and use your hands or a fork to toss them and spread them out evenly.
    • Roast the onions for about 10 minutes. Then, stir once and then continue roasting for another 10 or so minutes, until the onions are tender and caramelized, and starting to get crispy on the sides! Serve as a side or snack!

    Notes

    • You can also use a mild yellow onion in this recipe but I prefer using a red onion since it turns out sweeter when caramelized! 
    • I prefer using avocado oil since it has a high smoke point and can withstand 400F oven temperatures without smoking. Olive oil works fine in the recipe if you reduce the temperature of the oven to 375F and roast for 25 to 30 minutes instead!
    • You can use a glass or ceramic baking dish or a cast iron skillet. I find that using a cast iron skillet creates crispier edges, but make sure to use an enameled one or ensure that the bottom is coated in a thin layer of oil to prevent any sticking!  

    Nutrition

    Calories: 44kcal | Carbohydrates: 3g | Protein: 1g | Fat: 4g | Saturated Fat: 1g | Sodium: 583mg | Potassium: 48mg | Fiber: 1g | Sugar: 1g | Vitamin A: 2IU | Vitamin C: 2mg | Calcium: 8mg | Iron: 1mg
    Tried this recipe?Tag @urbanfarmie or #urbanfarmie to let me know – I would LOVE to see your creations!
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    Shruthi Baskaran - Recipe Developer, Food Photographer, and Blogger at Urban Farmie

    I am Shruthi, the recipe developer, photographer and blogger behind Urban Farmie. I have two graduate degrees from Stanford, one focused on food systems. And I hope to bring you everything you need for healthy-ish, comforting, nourishing vegetarian cooking.

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    Recipe Key

    Dairy free
    Gluten free
    Nut free
    Vegan
    Vegetarian

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