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    Home » Recipes » Lunch

    Tuna Crunch Filling (for Sandwiches and Salads)

    Published: January 11, 2024 by Andrea · This post may contain affiliate links. Please read the disclosures and disclaimers page for details.

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    This tuna crunch sandwich filling is simple, easy and delicious. Use this filling to make tuna crunch sandwiches, to use in salads or on baked potatoes.

    Tuna crunch filling on a white plate with small pot of chopped red onion in background.

    If you’re looking for a hassle-free filling for your sandwiches, salads or baked potatoes then try this crunchy tuna filling. There is no cooking involved and and it takes around 5 minutes to prepare so it’s great for time saving. 

    The crunch comes from adding red onion and finely diced cucumber to give an extra crunchy texture. It is seasoned and mixed with mayonnaise to make a delicious filling you can enjoy for lunch or dinner. To make this tuna crunch filling, I use reduced fat mayonnaise to save on some calories but feel free to use any mayonnaise you prefer. 

    Ingredients for Tuna Crunch Filling

    Please find the full list of ingredients and quantities in the recipe card at the end of the post. 

    • Tuna – use canned tuna in brine or spring water.
    • Onion – use red onions or spring onion if you prefer a milder flavour.
    • Cucumber – use regular English cucumber.
    • Salt – optional. If you are using brined tuna then you probably won’t need salt.
    • Black pepper – use a good quality black pepper to season the tuna.
    • Mayonnaise – you can use any mayonnaise but use reduced fat if you’re watching your calories.
    • Lemon juice – squeezed from a fresh lemon.
    • Parsley – use fresh parsley.
    Tuna crunch filling on a white plate with small pot of chopped cucumbers in background.

    How to Make Tuna Crunch Filling

    1. Open the can or pot of tuna and drain the liquid then add the tuna to a bowl. Finely chop the onion and the cucumber into small cubes then add them to the tuna.

    2. Season the tuna with salt if using and black pepper then add the mayonnaise, lemon juice and some chopped parsley. Mix well to combine then refrigerate until needed.

    Recipe Tips

    • This recipe uses 1 can of tuna and serves 2. The recipe can be easily be doubled to serve 4.

    Nutrition

    Nutrition based on 1 serving with reduced fat mayonnaise - Calories: 130kcal | Fat: 5.9g | Saturates: 0.7g | Carbs: 3.4g | Sugar: 1.7g | Fibre: 0.6g | Protein: 16.0g | Salt: 0.84g.

    Storage

    Store any leftover tuna crunch filling in the fridge for up to 2 days.

    close up of tuna crunch sandwich filling

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    tuna crunch on plate
    Print Recipe Pin Recipe

    Tuna Crunch Filling (for sandwiches or salads)

    This tuna crunch filling is simple, easy and delicious. There is no cooking involved and you can use this filling for sandwiches or on baked potatoes.
    Prep Time5 minutes mins
    Total Time5 minutes mins
    Author: Andrea
    Yield: 2 servings
    Calories: 130kcal

    Ingredients

    • 110g tuna (steaks or chunks) 1 can
    • ½ small red onion
    • 40g cucumber
    • ½ teaspoon salt omit if using brined tuna
    • ½ teaspoon black pepper
    • 40g reduced fat mayonnaise
    • 1 teaspoon lemon juice squeezed from a fresh lemon
    • 1 sprig parsley optional

    Instructions

    • Open the can or pot of tuna and drain the liquid then add the tuna to a bowl. Finely chop the onion and the cucumber into small cubes then add them to the tuna.
    • Season the tuna with salt if using and black pepper then add the mayonnaise, lemon juice and some chopped parsley. Mix well to combine then refrigerate until needed.

    More Lunch

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    • Yorkshire Puddings 
    • Spicy Tuna Melt
    • Hot Honey Chicken Wings

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    Meet Andrea!

    Hi I’m Andrea and I am the writer and food photographer behind Andrea’s Dainty Kitchen. I share a selection of recipes and provide step by step instructions to help readers get the best results from their time in the kitchen.

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