01 - Place the daikon, carrots, cucumber, and bell pepper in a large bowl. For extra crispiness, sprinkle 1 tablespoon salt over the vegetables, toss thoroughly, and let stand for 15 minutes. Rinse under cold water and drain completely.
02 - In a small saucepan, combine rice vinegar, water, sugar, and salt. Heat over medium heat, stirring constantly until the sugar and salt are completely dissolved. Remove from heat and allow to cool to room temperature.
03 - Layer the vegetables, chilies, garlic, and peppercorns into a clean 1-quart jar or container, packing tightly to maximize capacity.
04 - Pour the cooled brine over the vegetables, ensuring they remain completely submerged. Seal the jar tightly with the lid.
05 - Refrigerate for at least 2 hours before serving. For optimal flavor development, allow to marinate overnight. Store refrigerated and consume within 2 weeks.