Name: Tuna Salad Stuffed Avocados for a Low-Carb Picnic Lunch
Prep time: 15 min
Total time: 15 min
Yield: 4 servings
Cuisine: American
Ingredients: 3 cans tuna in water (5 oz each, drained well and pressed dry with a paper towel); 4 ripe avocados (halved and pitted); 3 tablespoons mayonnaise; 1 tablespoon Dijon mustard; 2 stalks celery (finely diced); 3 tablespoons red onion (finely minced); 2 tablespoons fresh dill (chopped, or 1 teaspoon dried); 1 tablespoon fresh lemon juice (plus more for avocados); 1 teaspoon lemon zest; 1 teaspoon capers (drained and roughly chopped, optional); kosher salt and black pepper (to taste); 1 pinch smoked paprika (for serving)

Jump to Recipe

I started packing these for school pickup picnics when I needed something that would survive 45 minutes in a cooler bag without turning into a sad soggy sandwich.

The reason to make this twice: the tuna mixture gets better as it sits, which means you can make it the night before and the avocados take 90 seconds to prep at the park.

Tuna Salad Stuffed Avocados for a Low-Carb Picnic Lunch

Creamy, herb-flecked tuna packed into ripe avocado halves — no bread, no guilt, no fuss.

4.8 (166 reviews)

Gluten-freeDairy-freeLow-carbKetoPaleo

Prep15 min

Total15 min

Serves4 servings

LevelEasy

Ingredients

3 cans tuna in water , 5 oz each, drained well and pressed dry with a paper towel
4 ripe avocados , halved and pitted
3 tablespoons mayonnaise
1 tablespoon Dijon mustard
2 stalks celery , finely diced
3 tablespoons red onion , finely minced
2 tablespoons fresh dill , chopped, or 1 teaspoon dried
1 tablespoon fresh lemon juice , plus more for avocados
1 teaspoon lemon zest
1 teaspoon capers , drained and roughly chopped, optional
kosher salt and black pepper , to taste
1 pinch smoked paprika , for serving

Instructions

Drain all three cans of tuna thoroughly — press them against the can lid or squeeze through a clean kitchen towel until no liquid drips out. Wet tuna makes the filling watery and the avocados slide around. You want it dry enough that it clumps when pressed.

Add the drained tuna to a medium bowl and break it apart with a fork until there are no large chunks left. It should look shaggy and slightly fluffy, not packed.

Add the mayonnaise, Dijon, lemon juice, and lemon zest. Stir until everything is coated — it will smell bright and sharp from the lemon. Taste it now before adding the vegetables.

Fold in the celery, red onion, dill, and capers if using. The celery should give an audible crunch when you press a piece between your fingers — if it is soft, swap it for fresh. Season with kosher salt and black pepper. The mixture should taste assertive because the avocado will mellow it.

Halve the avocados and remove the pits. Squeeze a small amount of lemon juice over each cut surface right away — you want a faint citrus smell rising off the flesh, which tells you the browning is slowed. Use a spoon to scoop out a little extra flesh from the center if the well feels too shallow.

Divide the tuna salad evenly among the 8 avocado halves, mounding it slightly above the rim. Finish each with a pinch of smoked paprika — it adds a faint smokiness and a color contrast that makes the plate look intentional. Serve within 20 minutes of cutting the avocados for best texture.

Tips & Notes

Make the tuna mixture up to 24 hours ahead and refrigerate it covered. Fill the avocados only at the last possible moment — they brown within 30 minutes once cut, even with lemon juice.
If you are packing these for a picnic, halve and fill the avocados on-site rather than at home. Keep the tuna mixture in a sealed container in your cooler and the whole avocados loose — they travel better uncut.
Greek yogurt can replace half the mayo for a slightly tangier, lower-fat version without changing the texture noticeably.
Choose avocados that yield gently to thumb pressure — a firm avocado will not scoop cleanly and a very soft one will collapse when filled.

Storage: Store leftover tuna mixture separately in an airtight container in the refrigerator for up to 3 days. Do not store filled avocado halves — they brown and turn watery. Cut and fill fresh each time.

Nutrition per serving · estimated

380 Cal

28g Fat

9g Carbs

28g Protein

7g Fiber

1g Sugar

390mg Sodium

[ep_amazon bestseller=”handheld citrus juicer” items=”3″]

Why No Bread Actually Works Here

The avocado is not a substitute for bread — it is a better delivery system. It holds the tuna without compressing it, adds fat that makes the whole thing more filling, and keeps each bite cool and creamy where bread would go soft.

One stuffed avocado half with a generous scoop of tuna is enough to carry an adult through a 3-hour afternoon without snacking. Two halves and you are set through dinner if something runs long.

Getting the Tuna Mixture Right Before You Fill Anything

The single move that separates a good tuna salad from a watery one is how dry your tuna is before it meets the mayo. Spend 60 seconds pressing it. It is the only part of this recipe that requires any real attention.

After that, taste the mixture before it goes into the avocado. It should taste slightly too salty and too lemony on its own — the avocado absorbs and softens both, and bland tuna salad inside an avocado just tastes like nothing.

Tuna Salad Stuffed Avocados for a Low-Carb Picnic Lunch