This Cucumber Sandwich with Herby Green Mayo is a fresh, simple take on the classic tea sandwich. Light and crisp with a creamy, herby spread, they’re easy to put together and perfect for a light lunch, afternoon tea, or a simple snack.
These little sandwiches are healthy, bright, and zesty — the kind of finger food you can serve on a spring afternoon or at a winter brunch.
The spread, aka the star of the show, is a homemade herby green mayo. But don’t worry, it’s easy and quick to make, and better yet, there are no raw yolks!
Herby Green Mayo
I wanted to simplify the mayo-making process as much as possible, so this mayo is easy to customize and foolproof. All you have to do is add the ingredients to a blender or food processor and blend until smooth.
These little sandwiches come together so quickly that the longest step is boiling the egg. This recipe uses a hard-boiled yolk for the mayo, so there’s no raw egg involved.
If you need a visual guide, watch the video below!
If you make this Cucumber Sandwich with Green Mayo please be sure to leave a comment! I’d love to hear from you.
A few Things to Keep in Mind
The cucumber is the main source of crunch here, and I like to peel and slice it very thinly – but of course, it’s up to you. You don’t have to do this, but I also like to season the cucumber slices with a little salt to draw out some of the excess water, then pat them dry before assembling the sandwiches.
Cucumber holds a lot of water, and removing some of that moisture helps keep the bread from getting soggy.
For the red onion, you can rinse the slices under cold water if you want to mellow their sharpness. This keeps the onion’s flavor while making it a little more delicate alongside the cucumber.
The sandwiches are best served soon after assembling, while the bread is soft and the vegetables are still crisp.
Serving Suggestions
These cucumber sandwiches are perfect for afternoon tea, brunch, or a light lunch. For a party or gathering, cut them into smaller pieces and serve them as finger food alongside other small bites.
They’re also a great addition to a picnic or a simple springtime spread.
More Sandwich Recipes
Chicken Liver Hummus Sandwich with Caramelized Onions: This simple sandwich combines roasted chicken livers, jammy caramelized onions, and hummus. It’s bold, comforting, and high in protein.
Chicken Salad Sandwich: This is a classic chicken salad recipe with a little twist. Simple, reliable, and exactly what you want for a quick, protein-packed weekday lunch.
Prosciutto and Goat Cheese Croissant Sandwich: This breakfast sandwich combines a flaky croissant with salty, tangy, sweet, and spicy flavors. Perfect early mornings or afternoon snacks.
Chicken Zucchini Sandwich with Caramelized Onions: Caramelized onions might take a little bit of time, but their deep, sweet flavor payoff paired with rotisserie chicken and fresh zucchini is surely worth it. This is a rich, bright sandwich that feels like a bistro meal.

Cucumber Sandwiches with Herby Green Mayo
Ingredients
Green Mayo:
- 1 egg yolk, hard-boiled
- 2 tbsp lemon juice
- 2 tbsp fresh parsley
- 2 tbsp fresh dill
- ¼ cup olive oil
- Salt and black pepper, to taste
Sandwiches:
- ½ cucumber
- ¼ red onion
- 6 slices sandwich bread
Instructions
- Prepare the vegetables: Thinly slice the cucumber and red onion. Rinse the onion slices under cold water to mellow their sharpness. Lightly salt the cucumber slices and let them sit for 5 minutes. Set aside.
- Make the green mayo: Add the hard-boiled egg yolk, lemon juice, parsley, dill, salt, and black pepper to a blender or food processor. Drizzle in half the olive oil and blend. Continue blending while slowly adding the remaining olive oil until the mixture is smooth and well combined.
- Assemble the sandwiches: Cut the crusts off each slice of bread. Spread the green mayo evenly over one side of 3 slices of bread. Pat the cucumber slices dry with a paper towel, then layer them over the bread with the red onion. Top with the remaining bread slices.
- Cut the sandwiches in half, if desired, and serve.
Video
@heythereannao cucumber sandwich with green mayo
♬ original sound - ꜰɪɪʀᴍᴇᴏʟᴅɪᴇꜱᥫ᭡