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Tuna on Toast

This sophisticated take on tuna on toast draws inspiration from the classic Spanish pan con tomate, elevated with rich, oil-packed bonito tuna. The combination of sweet, slowly caramelised onions and fresh, zesty grated tomatoes provides a vibrant contrast to the savoury fish. Using high-quality tinned tuna and a good extra-virgin olive oil ensures a depth of flavour that turns a simple pantry staple into an elegant light meal.

As a high-protein option, this dish is perfect for a nutritious lunch or a Mediterranean-style appetiser when entertaining friends. The crisp baguette provides a satisfying crunch, while the fresh chives add a final touch of brightness. It is a wonderful example of how few ingredients, prepared with care, can create a balanced and healthy dish that feels truly indulgent.

Continue reading below

Ingredients for Tuna on Toast

  • 1 tablespoon extra-virgin olive oil (preferably Spanish)

  • 1 medium yellow onion, thinly sliced

  • 1/2 teaspoons sea salt, divided

  • 4 plum tomatoes, halved lengthwise

  • 1 baguette, cut into 16 slices (1/2 inch each) and toasted

  • 1 can (170g) Spanish oil-packed bonito tuna (such as Ortiz), drained and flaked

  • 1 tablespoon chopped fresh chives

Heat oil in a medium pan over low heat. Cook onion until golden brown, about 30 minutes. (Add 1 to 2 tablespoons water if onions stick.) Add 1/4 teaspoons sea salt; set aside. Place a grater over a bowl. Rub cut surfaces of tomatoes across grater. Discard skins. Add remaining 1/4 teaspoons salt. Spread grated tomato over toasts (about 1 teaspoon per toast). Top with onion and tuna. Garnish with chives.

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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