Skip to main content

Prawns Sandwiches with Tarragon-Caper Mayonnaise

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.

Continue reading below

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
flu eligibility checker

Ask, share, connect.

Browse discussions, ask questions, and share experiences across hundreds of health topics.

symptom checker

Feeling unwell?

Assess your symptoms online for free

Sign up to the Patient newsletter

Your weekly dose of clear, trustworthy health advice - written to help you feel informed, confident and in control.

Please enter a valid email address

By subscribing you accept our Privacy Policy. You can unsubscribe at any time. We never sell your data.