Tuna + Lentil Salad Sandwich

Stretch a can of tuna (and your budget) by adding green lentils and veggies for a delicious, hearty and protein packed Tuna + Lentil Salad Sandwich!

Budget Tuna Lentil Salad

I love finding ways to stretch the food budget. To save costs and make my evenings a bit more low-key, my Husband and I like to simply pack and eat leftovers for our lunches. A banana, yogurt and whatever-we-ate-last-night makes for an easy and yummy lunch. But some evenings we are lazy and don’t have leftovers since dinner was McDonalds (these are my confessions) or we were particularly hungry the night before and have not a morsel left to spare. As such, I like to have a few easy and on-hand lunch options that are healthier and more filling than a cup-of-noodles.

A tin of quality tuna is a great budget option to have on hand for weekday lunches. I mean, what is easier than opening a tin of tuna? Beyond being simple to prepare, this Tuna and Lentil Salad Sandwich is a nutritious, frugal and delicious way to stretch your can of tuna to feed more than one person! The flavor and texture of green lentils make the perfect mix-in for this tuna salad and goes well with the fresh and onion-y flavours of peppers, green onions and cucumbers.  You will be ready to face anything in the afternoon with this protein packed lunch!

Tuna + Lentil Salad Sandwich

Stretch a can of tuna (and your budget) by adding green lentils and veggies for a delicious, hearty and protein packed Tuna + Lentil Salad Sandwich!
Prep Time10 mins
Course: lunch
Cuisine: Canadian
Servings: 2


  • 1 tin flaked white tuna 170 gram tin
  • 1/2 cup green lentils prepared and drained
  • 1/4 cup diced green pepper
  • 1/4 cup diced cucumber
  • 1/8 cup green onion
  • 2 tablespoons mayonnaise
  • 1/4 teaspoon mustard
  • Salt and pepper to taste
  • Bread and lettuce, cut vegetables or crackers for serving


  • Drain tuna, ensuring no excess water remains in tin.
  • In small mixing bowl, combine all ingredients and mix well, ensuring not to mash the lentils.
  • Serve over fresh bread with washed and dried lettuce or with crackers or fresh veggies for dipping!



  1. What a great idea to add lentils to tuna! Your sandwich is packed with wonderful flavours!

    • PeppersPennies

      Right? It is such a simple idea that I feel like I stumble upon. I had one can of Tuna and needed to feed both my hungry husband and I. The results were better than I expected 🙂

  2. Since my husband introduced me to tuna salad sandwiches, I am a fan now. Here, the addition of green lentils makes it even more nutritious and tasty.

    • PeppersPennies

      Thanks Nicoletta 🙂 The lentils are a perfect compliment to the veggies and tuna. I honestly don’t know why I didn’t think of it sooner!

  3. I really like the idea of extending the classic tuna sandwich with lentils. I mean, it’s cheap, it’s protein-rich, and I have a feeling the texture really works. Very cool idea. Honestly, that’s a total keeper. I like lentils a lot, but I feel like you see a lot of the same things done with them. Kudos for thinking outside the box.

    • PeppersPennies

      Hey Sean! Texture 110% works. I was so surprised! I have been reading for years that mashed chickpeas are a great alternative to a Tuna Salad, so I thought I would try another pulse out to compliment the tuna. Super happy with the results!

  4. Hmmm, what a cool spin on the classic tuna sandwich! I NEVER would have thought to use lentils this way, but I’m totally going to try this out. I too love to keep a few cans of good quality tuna on hand and this is such an innovative way to incorporate more plant based protein. Delish!

    • PeppersPennies

      Hi Justine! Thanks for stropping-by and the comment. You’ll be very surprised by how well the two work together. I wish avocados were cheaper this time of year as I can just imagine how yummy the lentils and tuna would be with mashed avocados instead of mayo!

  5. Do you season the lentils with anything in particular when you cook them for this purpose?

    • PeppersPennies

      Hi Patii! I do not season them. You need to be careful when adding salt to lentils before they are fully cooked as it affects how they take in water as they cook. You can easily salt & pepper them after you simmer them, prior to mixing in the tuna mixture!

  6. I love a good tuna sandwich. The lentils sound like a tasty addition!

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