01 - Combine the julienned daikon, carrots, cucumber, and bell pepper slices in a large mixing bowl. For enhanced crunch, toss with 1 tablespoon salt and let stand 15 minutes. Rinse thoroughly under cold water and drain completely.
02 - Combine rice vinegar, water, granulated sugar, and kosher salt in a small saucepan. Heat over medium heat, stirring continuously until sugar and salt dissolve completely. Remove from heat and allow to cool to room temperature.
03 - Layer the prepared vegetables, chilies, garlic slices, and black peppercorns into a clean 1-quart glass jar or container.
04 - Pour the cooled brine over the vegetables, ensuring all pieces remain fully submerged. Seal tightly with the lid.
05 - Refrigerate for minimum 2 hours before serving. For optimal flavor development, marinate overnight. Keep refrigerated and consume within 2 weeks.