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Forager Sandwich

This vegetarian forager sandwich is a masterclass in earthy, savoury flavours. By combining meaty king trumpet mushrooms with a rich, dried mushroom mayonnaise and zestily marinated shallots, this dish delivers a sophisticated depth usually reserved for fine dining. The addition of garlicky kale and melted Swiss cheese provides a satisfying texture that elevates the humble roll into a truly substantial meal, perfect for a weekend brunch or a decadent lunch.

Focusing on seasonal greens and umami-rich fungi, this recipe is an excellent choice for those seeking a comforting yet healthy vegetarian option. The components can be prepared in advance, making it an easy choice for hosting friends or family. Serve these toasted brioche rolls warm from the grill with a dash of green chilli hot sauce for a gentle heat that cuts through the creamy mayonnaise and rich buttered eggs.

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Ingredients for Forager Sandwich

  • 1/2 shallot, thinly sliced

  • 1 sprig thyme

  • 110g king trumpet mushrooms (about 2), sliced 1/4" thick, lightly scored

  • 60ml olive oil

  • 60ml white wine vinegar

  • 1 1/2 teaspoons kosher salt

  • 2 tablespoons olive oil

  • 1 medium onion, finely chopped

  • 2 garlic cloves, finely chopped

  • 2 large bunches kale, ribs and stems removed, leaves chopped (about 900g )

  • 1/2 teaspoons crushed red pepper flakes

  • Kosher salt

  • Freshly ground black pepper

  • 60ml dried mushrooms (such as black trumpets)

  • 1/2 shallot, very finely chopped

  • 120ml mayonnaise

  • 1 tablespoon fresh lemon juice

  • 1 teaspoon very finely chopped rosemary

  • Kosher salt

  • Freshly ground black pepper

  • 2 tablespoons olive oil

  • 1 tablespoon unsalted butter

  • 4 large eggs

  • 4 brioche, challah, or potato rolls, split, buttered, lightly toasted

  • 4 slices Swiss cheese

  • Green chilli hot sauce (optional

  • for serving)

Toss shallot, thyme, mushrooms, oil, vinegar, and salt in a medium bowl. Let sit at room temperature 1 hour.

Heat oil in a large skillet over medium heat. Cook onion and garlic, stirring often, until onion is softened and just translucent and garlic is golden, about 4 minutes.

Working in batches, add kale, tossing and letting it wilt slightly before adding more.

Reduce heat to medium-low and cook kale, tossing often, until tender, 12–15 minutes.

Mix in red pepper flakes and season with salt and pepper.

Place dried mushrooms in a small bowl and cover with boiling water; let stand until rehydrated and pliable, 5–8 minutes. Drain, squeeze out excess moisture, and finely chop.

Mix mushrooms, shallot, mayonnaise, lemon juice, and rosemary in a small bowl; season with salt and pepper. Cover and chill.

Heat oil in a medium skillet over high heat. Drain marinated mushrooms, pat dry, and cook until deep golden brown, 6–8 minutes per side.

Meanwhile, heat butter in a medium nonstick skillet over low heat and cook eggs, stirring occasionally with a heatproof spatula, until just barely set, about 4 minutes (or cook over easy, if you prefer).

Heat grill. Spread cut sides of rolls with mushroom mayo (you may have some left over). Place rolls, cut side up, on a broilerproof rimmed baking sheet. Layer bottom halves of rolls with marinated mushrooms, kale mixture, scrambled eggs, and cheese. Grill until cheese is melted.

Close sandwiches and serve with hot sauce, if desired.

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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