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Smoked Trout Crostini with Grilled Fennel and Red Onion

These smoked trout crostini with grilled fennel and red onion offer a sophisticated yet simple start to any meal. This high-protein appetiser combines the delicate, salty notes of flaked trout with the mellow sweetness of charred red onion and the subtle aniseed flavour of grilled fennel. It is a fantastic choice for summer entertaining or as a light, savoury snack that feels far more indulgent than its healthy ingredients suggest.

Designed as a deconstructed sharing platter, this dish encourages guests to assemble their own snacks, making it an interactive choice for dinner parties. The fennel and onion provide a satisfying crunch that pairs perfectly with the crisp, toasted baguette. For the best result, use high-quality fillets from your local fishmonger or delicatessen and serve with a squeeze of fresh lemon.

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Ingredients for Smoked Trout Crostini with Grilled Fennel and Red Onion

  • 20 1/2-inch-thick diagonal slices crusty baguette

  • 20 1/2-inch wedges fresh fennel bulb (from about 2 large bulbs), fronds reserved for garnish

  • 20 1/2-inch wedges red onion (from 2 large onions)

  • Olive oil

  • 3 4 1/60g packages skinless smoked trout fillets,* broken into chunks

On separate baking sheets, arrange bread and vegetables; brush both sides with oil and sprinkle with salt and pepper.

Prepare barbecue (medium-high heat) or preheat grill. Grill or grill bread until crisp, about 2 minutes per side if grilled, and 1 to 2 minutes per side if grilled. Grill or grill vegetables until golden and just tender, about 4 minutes per side if grilled, and 3 to 4 minutes per side if grilled. DO AHEAD: Can be made 2 hours ahead. Let stand at room temperature.

Arrange bread, vegetables, and trout on large platter. Garnish with fennel fronds. Serve, allowing guests to assemble crostini.

Available at some supermarkets and at specialty foods stores and delicatessens.

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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UK recipe editors

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UK recipe editors

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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