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If the meat (or deli meat) of choice needs to be cooked, cook it, slice it, and set aside.
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Add water to a pot and bring it to a boil. Add the sliced potatoes and cook for 10-15 minutes, or until fork-tender. Drain the potatoes in a strainer and transfer them to a bowl. Smash the potatoes while still hot, leaving some chunks if desired. Season with rice vinegar, salt, and pepper. Let the mixture cool completely.
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In a small bowl, add the cucumber and carrot slices. Sprinkle with salt and let them sit for 5-10 minutes. After the time is up, squeeze out any excess water from the vegetables. Alternatively, you can briefly boil the carrot slices for 1-2 minutes. (I prefer to keep mine on the crunchy side, so I didn’t boil them.)
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Once the mashed potatoes have cooled, add the remaining ingredients—cucumber and carrot slices, sliced spring onions, corn, eggs, deli meat, Kewpie mayonnaise, salt, and pepper. Mix everything together, taste, and adjust seasoning if necessary.