Japanese Potato Salad With Cucumbers Carrots and Red Onion Recipe

Name: Japanese Potato Salad With Cucumbers, Carrots, and Red Onion Recipe
Ingredients: 1 1/2 pounds russet potatoes, about 3 large potatoes, peeled and quartered; Kosher salt; 2 Persian cucumbers, thinly sliced crosswise; 2 teaspoons rice wine vinegar; 6 tablespoons homemade or store-bought Japanese mayonnaise, such as Kewpie; 1/2 teaspoon Japanese hot mustard; 1 small carrot, quartered and thinly sliced crosswise; 1/4 red onion, thinly sliced; 2 hard boiled eggs, chopped; 1 scallion, white and light green parts only, chopped