Roasted Sardines with Carrot-Fennel Slaw
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 16 Jan 2026
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These roasted miso sardines with carrot-fennel slaw offer a sophisticated yet simple way to enjoy oily fish. The savoury umami of the white miso and mirin glaze perfectly complements the natural richness of the sardines, while the quick-pickled slaw provides a sharp, crunchy contrast. Using rainbow carrots adds a vibrant splash of colour to the plate, making this a visually stunning dish that feels far more indulgent than its healthy profile suggests.
This diabetes-friendly recipe is an excellent choice for a light lunch or a nutritious midweek supper. Sardines are a fantastic source of heart-healthy omega-3 fatty acids and vitamin D, making this a wholesome option for those managing their blood sugar levels. Serve the fish warm from the oven alongside the refreshing slaw for a balanced, low-carbohydrate meal that is packed with fresh Mediterranean and Japanese-inspired flavours.
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Ingredients for Roasted Sardines with Carrot-Fennel Slaw
60ml plus 1 tablespoon brown rice vinegar, divided
1 teaspoon natural cane sugar
1/4 teaspoons fine sea salt
1/4 teaspoons crushed red pepper flakes
6 rainbow carrots
1 small fennel bulb with fronds, cored
8 large sardines
45ml white miso
1 tablespoon mirin
1 teaspoon brown sugar
1 garlic clove, minced
Toasted sesame oil
How to make Roasted Sardines with Carrot-Fennel Slaw
Preheat oven to 400°.
To prepare the slaw, whisk together 60ml brown rice vinegar, sugar, salt, and red pepper flakes. Rinse outer skin of carrots. Use a vegetable peeler to peel carrots lengthwise, creating long ribbons. Place in a mixing bowl. Next, slice fennel crosswise very thinly with a sharp knife or mandoline. Reserve fennel fronds for garnish. Toss brown rice vinegar mix with carrots and fennel. Set aside.
If your sardines have not been gutted by your fishmonger, do this now. Slice each sardine along the length of the belly and remove the organs by gently pulling them out with your fingers; discard. Rinse sardines thoroughly under cool water. Drain on paper towels and blot dry.
Combine miso, mirin, remaining 1 tablespoon brown rice vinegar, brown sugar, and garlic with a fork to make a paste. Arrange fish on a baking sheet. Brush insides of sardines with miso paste. Brush outsides with sesame oil.
Roast sardines until cooked through, about 8 minutes.
Using tongs, remove slaw from bowl, draining off any excess liquid, and divide among 4 plates. Top each with 2 sardines and finish with a few fennel fronds.
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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