Roasted Carrots and Red Onions with Fennel and Mint
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 16 Jan 2026
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This vibrant vegan dish of roasted carrots and red onions with fennel and mint is a masterclass in balancing earthy, sweet, and zingy flavours. By roasting the vegetables until their natural sugars caramelise, you create a deeply savoury base that contrasts beautifully with the aromatic fennel. It is a sophisticated yet simple side dish that brings a burst of colour to any dinner table, particularly during the cooler months when root vegetables are at their best.
Packed with texture from toasted sunflower seeds and a hint of warmth from Aleppo pepper, this healthy vegetable recipe is ideal for weekend entertaining or as part of a plant-based Sunday roast. The spiced vinaigrette can be prepared in advance, allowing the flavours to meld, while the addition of fresh mint provides a cooling finish. Serve it warm or at room temperature for a flexible addition to your repertoire.
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Ingredients for Roasted Carrots and Red Onions with Fennel and Mint
900g small carrots (about 2 bunches), peeled, cut into 3" pieces
2 large red onions, each cut through root end into 8 wedges
1 fennel bulb, cut into 1/2" wedges
4 tablespoons olive oil, divided
Kosher salt, freshly ground pepper
2 tablespoons raw sunflower seeds
1 teaspoon coriander seeds, coarsely chopped
1/2 teaspoons Aleppo pepper or a pinch of crushed red pepper flakes
1/2 teaspoons Hungarian hot paprika
2 tablespoons Sherry vinegar or red wine vinegar
1 tablespoon fresh lemon juice
2 tablespoons torn mint leaves
How to make Roasted Carrots and Red Onions with Fennel and Mint
Preheat oven to 218°C. Place carrots on a rimmed baking sheet and onions and fennel on another rimmed baking sheet. (Make sure to give them plenty of room, which is key to roasted veggies with nicely browned edges.) Drizzle vegetables with 2 tablespoons oil, dividing evenly; season with salt and pepper. Roast, tossing occasionally, until golden brown and tender, 20–25 minutes for carrots and 35–45 minutes for onions and fennel. Let cool.
Meanwhile, cook sunflower seeds, coriander seeds, Aleppo pepper, paprika, and remaining 2 tablespoons oil in a small skillet over medium heat, stirring often, until oil is gently bubbling around seeds and spices are fragrant (be careful not to burn), about 2 minutes. Let cool. Stir in vinegar and lemon juice; season vinaigrette with salt and pepper.
Combine roasted carrots, fennel, and onions onto the same baking sheet, drizzle vinaigrette over, and toss to coat well; transfer to a platter.
Just before serving, re-toss vegetables to pull up any dressing that may have settled at the bottom of the platter and scatter mint over top.
Dish (without mint) can be made 3 hours ahead. Store tightly wrapped at room temperature.
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.
Article history
The information on this page is peer reviewed by qualified clinicians.
16 Jan 2026 | Originally published
Authored by:
UK recipe editors
Peer reviewed by
UK recipe editors

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