R-rated onions: Spicy recipes for bold flavour lovers
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 17 Oct 2025
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R-Rated Onions is a delightful vegan dish that showcases the humble onion in all its glory. Caramelised to perfection, these onions transform from sharp and pungent to sweet and savoury, creating a comforting side that enhances a variety of meals. With just a few simple ingredients like olive oil and kosher salt, this recipe highlights the natural flavours of onions, making it an ideal choice for those seeking a healthy, plant-based option.
Perfect for family dinners or as an accompaniment to grilled vegetables, R-Rated Onions are not only easy to prepare but also a wonderful way to elevate everyday dishes. Serve them alongside roasted meats or toss them into a hearty salad for a burst of flavour. This dish is a fantastic way to incorporate more vegetables into your diet while enjoying a satisfying and wholesome meal.
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Ingredients for R-rated onions
480–600 g yellow or white onions, large or medium
15 ml olive oil or vegetable oil
5 ml kosher salt
How to make R-rated onions
Peel the onions and cut them in half through their stem ends, slicing longways. Slice them thinly along the grain, following the line from root to stem, as this will help achieve silky onions.
Heat a frying pan over medium-high heat. Add the oil, followed by the sliced onions and salt. Allow the onions to sizzle for a couple of minutes.
Stir the onions with a wooden spoon or heatproof spatula, watching them wilt for about 3 minutes. Reduce the heat to medium-low and cover the pan with a lid. Step away for a few minutes, stirring the onions occasionally.
Scrape up any caramelised bits that accumulate at the bottom and sides of the pan, stirring them into the onions. While a little colour is fine, avoid rushing the browning process. The aim is to cook the onions gently, guiding them through stages of raw, wilted, sweaty, soft, light brown, and finally deeply caramelised.
After about 45 minutes, remove the lid for the final time. The onions should be a light caramel colour at this stage.
With the lid off, watch the onions more closely and stir more frequently. If any of the caramelised bits begin to cling to the pan and threaten to burn, don’t worry. Add about 125 ml of water to the pan and use it to help scrape up the stubborn bits. Allow the water to cook off.
Once you have a soft, creamy, and fragrant pile of mahogany onions, you’re done.
Note: R-Rated Onions can be stored in the fridge for up to a week and in the freezer for up to 3 months.
Disclaimer
While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.
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Article history
The information on this page is peer reviewed by qualified clinicians.
17 Oct 2025 | Originally published
Authored by:
UK recipe editors
Peer reviewed by
UK recipe editors

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