Tuna Avocado Cucumber Boats
By Better Plate RecipesTuna Avocado Cucumber Boats are a crisp, no-cook lunch made with English cucumber halves filled with tuna, avocado, Greek yogurt, lemon, dill, red onion, and Dijon. The filling is creamy and bright, the cucumber stays cool and crunchy, and the boats are best filled right before serving.
Why You’ll Love This Recipe
This recipe is light, fresh, and satisfying without needing bread or any cooking. The cucumber boats give you a clean, crisp base, while the tuna brings protein and the avocado makes the filling creamy enough to feel filling. Greek yogurt keeps it lighter than a classic mayo-heavy tuna salad, and lemon juice, dill, Dijon, and finely diced red onion keep the flavor bright instead of flat. It is the kind of lunch that works especially well when you want something quick but still balanced. Since the cucumbers are filled right before serving, every bite has that nice contrast of cool crunch and creamy tuna avocado filling. It also keeps the ingredient list simple, so a beginner can make it without juggling pans, timers, or hot food.
What Makes This Recipe Work
Scooping the seeds from the cucumbers creates a natural little channel for the tuna filling, but leaving a sturdy cucumber wall keeps each boat from bending or breaking. Patting the inside dry is important because cucumbers release water quickly, and that extra moisture can loosen the filling. The avocado gives the tuna salad body and creaminess, while Greek yogurt adds tang without making it heavy. Lemon juice brightens the avocado, dill brings a fresh herb flavor, Dijon adds a tiny sharp note, and very finely diced red onion gives just enough bite. The recipe works best when the filling is creamy but still has some texture, not mashed into a paste. That texture matters because the cucumber is firm and crunchy, so a filling with a little flake feels more pleasant in each bite.
Ingredient Notes & Easy Swaps
English cucumbers: English cucumbers are long, crisp, and have tender skin, which makes them good for boats. Scoop gently so the cucumber stays sturdy.
Tuna in water: Drain the tuna very well so the filling does not turn watery. Canned tuna is the main source of sodium here, so choose a lower-sodium tuna and taste the filling before adding the 1/4 teaspoon salt. For a seafood-free version, use 1 1/2 cups drained, lightly mashed chickpeas in place of the tuna, adding 1 extra tablespoon of yogurt only if the filling looks dry.
Avocado: Avocado makes the filling creamy and helps replace heavier mayo. Use one that gives slightly when pressed so it mashes smoothly.
Greek yogurt: Greek yogurt adds creaminess and tang. For dairy-free, use an equal amount of plain dairy-free yogurt.
Lemon juice: Lemon brightens the tuna and helps keep the avocado from browning too quickly. Lime juice can work too.
Fresh dill: The recipe uses 2 tablespoons chopped dill, divided: 1 tablespoon goes into the filling and the remaining 1 tablespoon is used for garnish. Parsley, chives, or green onion can be used instead.
Red onion and Dijon mustard: Finely diced red onion adds crunch and sharpness, and Dijon adds tang and depth. Use a small amount of onion so it does not overpower the avocado and tuna.
Microgreens: The optional garnish is 1/4 cup microgreens, added along with the reserved dill. Leave them out if you do not have them; the boats still look and taste finished.
Tuna Avocado Cucumber Boats
Description
Tuna Avocado Cucumber Boats are a crisp, no-cook lunch made with English cucumber halves filled with tuna, avocado, Greek yogurt, lemon, dill, red onion, and Dijon. The filling is creamy and bright, the cucumber stays cool and crunchy, and the boats are best filled right before serving.
Ingredients
- 2 large English cucumbers
- 2 (5 oz) cans solid white albacore tuna in water, well drained
- 1 ripe avocado
- 2 tbsp plain Greek yogurt
- 1 tbsp fresh lemon juice
- 2 tbsp fresh dill, chopped and divided
- 1 tbsp red onion, very finely diced
- 1/2 tsp Dijon mustard
- 1/4 tsp fine sea salt
- 1/4 tsp black pepper
- 1/4 cup microgreens (optional)
Instructions
- 1Equipment: a cutting board, a sharp knife, a small spoon for scooping cucumber seeds, a medium mixing bowl, a fork, paper towels, measuring spoons, and a serving platter.
- 2Trim the ends off both English cucumbers.
- 3Slice each cucumber in half lengthwise to make 4 long cucumber halves.
- 4Use a small spoon to gently scoop out the watery seeds from the center of each cucumber half, leaving at least 1/4 inch of cucumber around the edges so the boats stay sturdy.
- 5Pat the inside of each cucumber boat dry with paper towels.
- 6Arrange the cucumber boats cut side up on a serving platter or large serving dish.
- 7Open and drain both cans of tuna very well, pressing out extra water if needed.
- 8Cut the avocado in half, remove the pit, and scoop the avocado flesh into a medium mixing bowl.
- 9Mash the avocado with a fork until mostly smooth with a few small soft chunks.
- 10Add the drained tuna, 2 tablespoons Greek yogurt, 1 tablespoon lemon juice, 1 tablespoon of the chopped dill, 1 tablespoon finely diced red onion, 1/2 teaspoon Dijon mustard, 1/4 teaspoon fine sea salt, and 1/4 teaspoon black pepper.
- 11Stir gently until the mixture looks creamy and evenly combined. Stop mixing while it still has a little texture and does not look pasty.
- 12Spoon the tuna avocado mixture evenly into the 4 cucumber boats.
- 13Garnish with the remaining 1 tablespoon chopped dill and 1/4 cup microgreens if using.
- 14Serve right away, 2 cucumber boats per person, while the cucumber is still crisp and cold, or keep the filling at 40 degrees F or below until you are ready to fill the boats.
Tips and Tricks
- 1
Drain the tuna until it looks flaky instead of wet. Extra water makes the avocado yogurt filling loose, and then it can slide out of the cucumber boats instead of sitting neatly in the center. This matters more with canned tuna than freshly cooked fish because the canning liquid hides between the flakes.
- 2
Pat the cucumber boats dry after scooping out the seeds. This small step keeps the filling creamy and helps the cucumber stay crisp longer, especially if the cucumbers were very juicy inside. Moisture also makes the avocado filling separate faster, so drying the cucumber gives you a cleaner bite.
- 3
Use an avocado that gives slightly when pressed. A firm avocado will not mash smoothly, while an overly soft avocado can make the filling taste dull and look brown before the boats are served. The avocado is the main creamy ingredient here, so its ripeness affects both flavor and how easily the filling mixes.
- 4
Fill the cucumber boats close to serving time. The filling has avocado and the cucumbers naturally release moisture, so assembling right before eating gives you the best color, cleanest texture, and strongest crunch. It also prevents the cucumber from watering down the filling while it sits, which is what makes the boats lose their snap.
Nutrition
Serving size: 2 cucumber boats (1/2 recipe)
Calories: 310kcal, Protein: 32g, Carbs: 20g, Fat: 13g, Fiber: 7g, Sugar: 7g, Sodium: 700mg.
Nutrition information is an estimate and may vary based on ingredient brands, product sizes, preparation methods, and substitutions. It is not intended as medical or dietary advice.