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1
Put a steamer basket (or a colander, so long as the pot's lid can still close) in a large pot with a lid. Add about 1/2 inch water to the pot, pop on the lid, and bring to a boil over high heat. Add the daikon radishes to the insert, cover again, and let them steam until they're fully tender but not mushy, 12 to 15 minutes. Remove the daikon and let it cool.
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2
Put the steamed and raw radishes in the fridge to chill for about 15 minutes.
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3
Meanwhile, put the sesame seeds in a small skillet. Set it over medium heat and toast, stirring and tossing frequently, until they're a few shades darker, 3 to 5 minutes.
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4
Transfer them to a bowl to cool. Set 1 tablespoon of the seeds aside and pour the rest into a mortar, along with a pinch of salt. Thoroughly pound the seeds, add 1 tablespoon of the neutral oil, and stir until smooth.
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5
Pulse half of the drained kimchi in a small food processor until you have a coarse puree (alternately, simply chop it finer by hand). Transfer it to a bowl and mix in the rest of the kimchi, the kimchi liquid, the sesame oil, the remaining 3 tablespoons of the neutral oil, and 1 teaspoon of salt.
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6
Combine the kimchi mixture, steamed radishes, raw radishes, and Little Gem leaves in a large bowl and toss well. Season to taste with salt and transfer the vegetables to a plate in a heap. Drizzle the sesame paste mixture over the vegetables, then sprinkle on the remaining sesame seeds.