Korean Potato Salad | Gamja Salad

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Ingredients:

3 large russet potatoes,
1/2 red onion, diced,
1 medium carrot, sliced,
1 Persian cucumber, sliced
2 hard-boiled eggs, diced

Seasoning:
1 tsp salt,
1 tsp black pepper,
1 tsp sugar,
1 tbsp white vinegar,
5-6 tbsp mayonnaise

optional*
diced ham,
diced apple