Prawns Sandwiches with Tarragon-Caper Mayonnaise
Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 17 Jan 2026
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These prawns sandwiches with tarragon-caper mayonnaise offer a sophisticated twist on the classic seafood roll. By combining juicy, king prawns with a zesty homemade dressing, this high-protein lunch option delivers a wonderful balance of creamy textures and sharp, herbaceous notes. The addition of crunchy celery hearts and briny capers provides a satisfying contrast to the soft, toasted buns, making every bite feel like a coastal treat.
Ideal for a light summer lunch or an impressive weekend brunch, this recipe is incredibly simple to assemble. If you are preparing for guests, the flavoured mayonnaise can be made a few hours in advance to allow the tarragon and onion flavours to develop fully. Serve these rolls alongside a crisp green salad for a nutritionally balanced and refreshing meal.
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Ingredients for Prawns Sandwiches with Tarragon-Caper Mayonnaise
80ml mayonnaise
2 tablespoons drained capers, finely chopped
1 1/2 tablespoons grated sweet onion (such as Vidalia or Maui)
1 tablespoon chopped fresh tarragon
1/4 teaspoons celery seeds
1/4 teaspoons (or more) hot pepper sauce
1/2 cup finely chopped celery heart with leaves
2 tablespoons (1/4 stick) butter, room temperature
12 small (3-inch round) soft sandwich rolls or 6 hot dog buns
450g cooked peeled deveined large prawns, each cut horizontally in half
Tomato slices (optional)
Avocado slices (optional)
Thinly sliced butter lettuce (optional)
How to make Prawns Sandwiches with Tarragon-Caper Mayonnaise
Mix first 5 ingredients and 1/4 teaspoons hot sauce in medium bowl. Mix in celery. Season with salt and pepper and more hot sauce, if desired. DO AHEAD Mayonnaise can be made 6 hours ahead. Cover; chill.
Lightly butter cut sides of rolls. Heat griddle or large nonstick skillet over medium heat. Add rolls, buttered side down, to griddle and cook until golden, 1 to 2 minutes. Spread mayonnaise over bottom of each bun. Top with prawns, tomato, avocado, and lettuce, if desired. Cover with top buns. Transfer to plates.
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.
17 Jan 2026 | Originally published
Authored by:
UK recipe editors
Peer reviewed by
UK recipe editors

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