Bring a large pot of water to a boil, then boil potatoes for 10-15 minutes or until tender (when you can easily stick a fork into it). Drain and let cool before chopping into 1-inch cubes.

While waiting for potatoes to cook, prepare the dressing by whisking all the dressing ingredients in a small bowl until combined. Taste and adjust seasoning if needed. Set aside.

Carefully place eggs into the pot with cold water. Make sure the eggs are covered by 1-2 inches of water. Bring water to a simmer over medium heat and cook eggs for 6-8 minutes or done to desired liking. Meanwhile, prepare an ice bath. 
When the eggs are done cooking, remove them from the pot and immediately dunk in ice bath. Peel the eggs and chop into smaller pieces.

Add chopped potato, eggs and drained tuna to a large mixing bowl. Drizzle dressing all over and toss to combine. Season to taste with more salt and pepper if necessary. Enjoy!