Cook the Potatoes: Place cubed potatoes in a large pot and cover with cold salted water. Bring to a boil and cook for 12-15 minutes until fork-tender but not mushy. Drain thoroughly and let cool slightly.
Prepare Hard-Boiled Eggs: Place eggs in a saucepan, cover with cold water, and bring to a boil. Once boiling, remove from heat, cover, and let sit for 12 minutes. Transfer to ice water, then peel and chop into small pieces.
Prepare Vegetables: While potatoes cool, dice the carrot, cucumber, and apple into small, uniform pieces. If using frozen corn, thaw and drain well.
Make the Dressing: In a small bowl, whisk together Japanese mayonnaise, rice vinegar, sugar, Dijon mustard, salt, white pepper, and sesame oil until smooth and well combined.
Mash the Potatoes: In a large bowl, gently mash the warm potatoes with a potato masher, leaving some small chunks for texture. Don't overmash - you want it mostly smooth with some texture remaining.
Combine Ingredients: Add the chopped eggs, diced carrot, cucumber, corn, apple, and green onions to the mashed potatoes. Gently fold together.
Add Dressing: Pour the dressing over the potato mixture and gently fold until everything is evenly coated and creamy.
Chill and Set: Cover and refrigerate for at least 1 hour to allow flavors to meld and the salad to firm up.
Final Garnish: Before serving, sprinkle with paprika, fresh chives, and sesame seeds if desired.
Notes
RECIPE TIPS
Use Yukon Gold potatoes for the best creamy texture
Don't overcook the potatoes - they should be tender but not falling apart
Japanese mayonnaise (Kewpie) is essential for authentic flavor
Salt the diced cucumber lightly and let drain for 10 minutes to prevent watery salad
Add the apple just before serving to prevent browning
Adjust sweetness to taste - some prefer it sweeter than others
Make sure all vegetables are diced uniformly for best presentation
SERVING SUGGESTIONS
Perfect alongside Korean BBQ (galbi, bulgogi)
Excellent with fried chicken or Korean fried chicken
Great as a cooling side for spicy Korean stews
Serve at summer BBQs and potluck dinners
Pack for picnics and outdoor gatherings
Use as a sandwich filling for a unique lunch option
VARIATIONS
Fruit Version: Add diced pear or persimmon for extra sweetness
Protein Addition: Include diced ham or cooked shrimp
Crunchy Elements: Add chopped walnuts or almonds
Spicy Kick: Mix in a small amount of gochujang for heat
Vegetarian: Skip the eggs and add extra vegetables
Premium Version: Use truffle oil or add avocado
STORAGE
Store covered in the refrigerator for up to 3 days
The flavors actually improve after the first day
Stir gently before serving as ingredients may settle
Add fresh herbs or a squeeze of lemon to refresh leftovers
Not suitable for freezing due to the mayonnaise base
For food safety, don't leave at room temperature for more than 2 hours