Sardine Toasts With Tomato Mayonnaise and Fennel
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 28 Jan 2026
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This sophisticated sardine toasts with tomato mayonnaise and fennel recipe offers a vibrant, Mediterranean-inspired twist on a classic high-protein lunch. By roasting plum tomatoes until charred and blending them with toasted spices like fenugreek and cumin, you create a deeply savoury tomato mayonnaise that perfectly complements the rich, oily texture of the sardines. The addition of a bright, citrusy fennel and herb salad provides a refreshing crunch that cuts through the richness of the fish.
Ideal for a quick weekend brunch or a nutrient-dense midweek supper, this dish is as healthy as it is flavourful. Sardines are an excellent source of omega-3 fatty acids and vitamin D, making this a fantastic choice for those looking to increase their oily fish intake. You can even prepare the spiced tomato mayonnaise up to five days in advance, allowing the flavours to develop and making the final assembly a simple task.
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Ingredients for Sardine Toasts With Tomato Mayonnaise and Fennel
675g plum tomatoes (about 10), halved lengthwise
60ml olive oil
Kosher salt
1/2 teaspoons fenugreek seeds
1/4 teaspoons cumin seeds
1/4 teaspoons black peppercorns
120ml mayonnaise
4 (3/4-inch-thick) slices country-style bread
3 tablespoons olive oil, divided
1 small fennel bulb, quartered lengthwise, very thinly sliced
1 tablespoon coarsely chopped dill
1 tablespoon coarsely chopped parsley
1 tablespoon fresh lemon juice
Kosher salt
2 (120g) cans oil-packed sardines, drained, pin bones removed
A spice mill or a mortar and pestle
How to make Sardine Toasts With Tomato Mayonnaise and Fennel
Back to contentsPreheat oven to 260°C. Toss tomatoes with oil on a rimmed baking sheet to coat. Roast until skin is blackened and tomatoes are very soft, 20–25 minutes. Pass tomatoes through finest disk of a food mill or a coarse-mesh sieve into a small saucepan; season with salt. Bring to a simmer over medium-low heat, stirring often, and cook until you have about 120ml tomato purée. Let cool.
Meanwhile, toast fenugreek, cumin, and peppercorns in a dry small skillet over medium heat, tossing often, until fragrant. Let cool and finely grind in spice mill or with mortar and pestle.
Mix tomato purée, spice mixture, and mayonnaise in a bowl; season with salt.
Prepare a grill for medium-high heat. (Alternatively, heat a grill pan over medium-high.) Brush both sides of bread with 2 tablespoons oil total and grill until lightly charred, about 2 minutes per side.
Toss fennel, dill, parsley, lemon juice, and remaining 1 tablespoon oil in a medium bowl; season with salt. Spread tomato mayonnaise over toast and top each with a few sardines and some fennel salad.
Tomato mayonnaise can be made 5 days ahead. Cover and chill.
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.
28 Jan 2026 | Originally published
Authored by:
UK recipe editors
Peer reviewed by
UK recipe editors

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