Fill large pot with water (salt, if desired). Peel and dice potatoes to 1-inch cubes. Place diced potatoes in water. Bring to a boil. Boil gently until potatoes are fork tender, about 10 minutes from boiling.
While potatoes are boiling, make dressing. In a large bowl whisk the fresh lemon juice, olive oil, fresh herbs, Dijon and salt.
Once potatoes are fork tender, drain water and toss potatoes into dressing. Gently stir and let cool.
While potatoes are cooling down, chop cucumber and onion (if using). Stir in with the potatoes and enjoy!
Video
Notes
Keep in fridge for up to 3 days.Don't over-cook the potatoes.