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This cucumber tomato avocado salad is a healthy side dish that takes no time to put together! It’s a go-to summer recipe and fits nearly every diet.

Cucumber tomato avocado salad
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Need a salad for when summer tomatoes are at their peak? Here’s our pick for you: this cucumber tomato avocado salad! This one is all about the ingredients: ripe and juicy tomatoes, cool cucumbers, and creamy avocado. They’re mixed with lime juice and cilantro for a tangy pop that perfectly accentuates their flavors. This one is great as a side dish for any meal; it specifically jives well with Mexican flavors with the lime and cilantro. Here’s how to make it!

Cucumber tomato avocado salad

Ingredients for this cucumber tomato avocado salad

This salad is all about knife skills! That’s right, the only real work in this salad is chopping. Luckily, Alex and I happen to be knife skills experts: we have a whole video series devoted to it! So we’ll walk you through some of the most important techniques. Here are the ingredients you’ll use for this cucumber tomato avocado salad:

  • Ripe tomatoes, multi-colored if desired (best during tomato season!)
  • Cucumber
  • Avocado
  • Red onion
  • Cilantro
  • Lime juice
  • Salt
  • Red pepper flakes (optional, but they add a subtle complexity

Eat it right away!

It turns out perfectly flavored: tangy and salty, and highlighting each vegetable to it’s fullest! This salad tastes best right away and leftovers don’t save so well. We recommend eating this salad the day it is made — and store it at room temperature if you make it a little ahead of eating. Some liquid will build up in the bottom of the bowl, so it’s best to serve it with a slotted spoon.

Cucumber tomato avocado salad

How to thinly slice an onion for salads: french cut!

Have you ever tried to cut an onion into thin slices, and then the half moons end up being large, floppy, and hard to eat? Here’s a method for thinly slicing an onion for salads that ends up with pieces all roughly the same size. Some people call this method “french-cut”. Whatever the case, it’s how we always slice an onion for salads because it ends up with beautiful thinly sliced slivers. Here’s how to slice an onion for salads:

  1. Cut off the top and bottom of the onion, then cut it in half.
  2. Use the knife to cut thin curved slices from end to end. This method is easiest to watch: so here’s a video of it! Fast forward to 1:45 to watch how to slice an onion for a salad.

How to (safely!) remove the pit from an avocado

Another veggie that requires some technique when chopping is avocado! It’s especially important to practice safe techniques when removing the pit of an avocado. We have a great method for removing the pit, and safely releasing the pit from the end of the knife! Here’s how to cut an avocado:

  1. Using a large chef’s knife, cut lengthwise around the avocado. Twist the two halves to separate them.
  2. Place a towel in your hand and put the avocado on top. With a gentle but quick motion, tap the knife into the avocado pit.
  3. Do not attempt to remove the avocado pit with your hand! Instead, pull the cutting board close to your body, then place the pit against the far edge of the cutting board and pull back to release it from the knife.
  4. Use a large spoon to scoop out the avocado from the peel. Place the avocado with the cut side down, then cut it into slices. Turn the slices and cut crosswise to make diced avocado.

How to cut tomatoes and cilantro

In this cucumber tomato avocado salad, you’ve still got to chop the tomatoes and cilantro! We’ll let you head over to these posts to learn more about our techniques for chopping tomato wedges and quickly chopping cilantro:

Cucumber tomato avocado salad

How to serve this cucumber tomato avocado salad

This cucumber tomato avocado salad works well as a summer side dish for any meal! It’s specifically suited to Mexican flavors because of the lime and cilantro, so it’s a great side to go with tacos or serve with fajitas. Since we’re always looking for recipes to fit with Mexican-style meals, we were excited to find this salad concept. Here are a few of the recipes we’d accessorize with this salad:

This cucumber tomato avocado salad recipe is…

Vegetarian, gluten-free, vegan, plant-based, and dairy-free.

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Cucumber tomato avocado salad

Cucumber, Tomato, & Avocado Salad

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5 from 2 reviews

  • Author: Sonja Overhiser
  • Prep Time: 15 minutes
  • Cook Time: 0 minutes
  • Total Time: 15 minutes
  • Yield: 4 to 6 1x


This cucumber tomato avocado salad is a healthy side dish that takes no time to put together! It’s a go-to summer recipe and fits nearly every diet.


  • 1 medium red onion
  • 3 large ripe tomatoes, multicolored if desired
  • 2 avocados
  • 1 medium cucumber (we like English cucumbers)
  • 2 tablespoons chopped cilantro
  • ¼ cup lime juice
  • ¾ teaspoon kosher salt
  • ⅛ teaspoon red pepper flakes


  1. Slice the onion into thin slivers and soak it in water while chopping the remaining ingredients (to reduce the strong flavor).
  2. Meanwhile, chop the cucumbers into bite-sized chunks. Chop the avocado. Cut the tomatoes into wedges, leaving the seeds intact. Finely chop the cilantro.
  3. Combine all ingredients in a bowl and stir gently to combine. Serve immediately with a slotted spoon (or allow to stand at room temperature until serving). There will be liquid in the bottom of the bowl, which is ok. Leftovers do not keep well, so eating the day of is recommended!
  • Category: Side Dish
  • Method: Raw
  • Cuisine: Vegetarian

Last updated: May 2020

About the authors

Sonja & Alex

Hi, we’re Alex and Sonja Overhiser, married cookbook authors, food bloggers, and recipe developers. We founded A Couple Cooks to share fresh, seasonal recipes for memorable kitchen moments! Our recipes are made by two real people and work every time.

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  1. Jill says:

    Made as directed, it was surprisingly delicious for such a simple recipe! Simple to whip up. Depending on your tastes you could omit the cilantro and the red onion and it would still be excellent. I think the fresh lime juice and red pepper flakes really kick it up.

  2. Cathy Macchietto says:

    Excellent!! Will be making this many times.