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Cucumber Avocado Tuna Sandwich

Creamy avocado tuna salad with crisp cucumber, lettuce, and dill on whole-grain bread.

Cucumber Avocado Tuna Sandwich features creamy avocado tuna salad with crisp cucumber, lettuce, and dill on whole-grain bread. The bread and filling are cooked or toasted separately, then brought together while the textures are at their best.

Jump to Recipe
Prep Time15 minutes
Cook TimeNo cooking required
Total Time15 minutes
Servings4
DifficultyEasy

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Ingredients

For the Tuna Filling

  • 2 cans (5 ounces each) tuna in water, drained very well
  • 1 large ripe avocado, divided
  • 1/3 cup plain Greek yogurt
  • 1 tablespoon lemon juice
  • 2 tablespoons chopped fresh dill
  • 1/2 teaspoon Dijon mustard
  • 1/2 teaspoon kosher salt
  • 1/4 teaspoon black pepper

For the Sandwiches

  • 8 slices whole-grain bread, lightly toasted
  • 1 English cucumber, thinly sliced and patted dry
  • 4 large green-leaf lettuce leaves

Substitutions

  • Mayonnaise can replace Greek yogurt for a richer filling.
  • Celery can replace cucumber inside the filling for more crunch.
  • Sourdough can replace whole-grain bread for a chewier sandwich.

Instructions

Step 1: Drain the Tuna

Press tuna firmly in a fine-mesh strainer to remove as much water as possible.

Drain the tuna for Cucumber Avocado Tuna Sandwich

Step 2: Mash the Base

Mash half the avocado with Greek yogurt, lemon juice, Dijon, salt, and pepper until mostly smooth.

Step 3: Fold the Filling

Add tuna and dill and fold gently, leaving some flakes intact. Dice the remaining avocado and fold it in last.

Fold the filling for Cucumber Avocado Tuna Sandwich

Step 4: Prepare the Bread

Lightly toast the bread and let it cool so it stays crisp without warming the filling.

Prepare the bread for Cucumber Avocado Tuna Sandwich

Step 5: Dry the Vegetables

Pat cucumber slices and lettuce dry.

Step 6: Assemble

Layer lettuce, tuna filling, and cucumber on four bread slices. Close with remaining bread.

Assemble for Cucumber Avocado Tuna Sandwich

Step 7: Slice and Serve

Cut diagonally and serve immediately with lemon wedges if desired.

Finished Cucumber Avocado Tuna Sandwich ready to serve

How to Store Leftovers

Refrigerate tuna filling within 2 hours for up to 2 days with plastic wrap pressed on the surface. Store cucumber, lettuce, and bread separately.

Do not freeze the filling or assembled sandwiches because avocado and cucumber lose texture.

How to Reheat

No reheating is needed. Serve the filling chilled on freshly toasted and cooled bread.

What to Serve With It

  • tomato soup
  • lemony greens
  • pickle spears
  • fresh berries
  • sparkling water

Common Mistakes to Avoid

  • Leaving water in the tuna.
  • Overmashing all the avocado into a paste.
  • Using wet cucumber or lettuce.
  • Putting warm toast against the cold filling.

Nutrition Information

Nutrient Per Serving
Calories 420
Protein 30g
Carbohydrates 38g
Fat 18g
Sugar 5g

Nutrition is an estimate and can vary with brands, portion size, ripeness, and substitutions.

Frequently Asked Questions

How do I know Cucumber Avocado Tuna Sandwich is done correctly?

No cooking is required; the ideal result has distinct tuna flakes and avocado pieces, dry crisp cucumber and lettuce, and bread that remains lightly crunchy.

How do I keep the best texture in Cucumber Avocado Tuna Sandwich?

Control surface moisture, avoid crowding, stop at the visual and temperature cues, and add avocado, cucumber, lettuce, and dill only at the final assembly. Store crisp, fresh, and sauced components separately whenever possible.

About the Author

Written and edited by the FreshFork Recipes Team.

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