01 - Combine daikon, carrots, cucumber, and bell pepper in a large bowl. Sprinkle with 1 tablespoon salt, toss thoroughly, and let stand for 15 minutes. Rinse under cold water and drain completely.
02 - In a small saucepan over medium heat, combine rice vinegar, water, sugar, and salt. Stir constantly until sugar and salt dissolve completely. Remove from heat and cool to room temperature.
03 - Layer the drained vegetables, chilies, garlic slices, and peppercorns into a clean 1-quart glass jar, packing tightly.
04 - Pour cooled brine over vegetables, ensuring they are fully submerged. Seal jar tightly with lid.
05 - Refrigerate for at least 2 hours before serving. For optimal flavor development, marinate overnight. Consume within 2 weeks.