01 - Place the daikon, carrots, cucumber, and bell pepper in a large bowl. Sprinkle 1 tablespoon salt over the vegetables, toss to coat, and let sit for 15 minutes to draw out excess moisture. Rinse thoroughly under cold water and drain well.
02 - In a small saucepan over medium heat, combine rice vinegar, water, sugar, and remaining salt. Stir continuously until sugar and salt are completely dissolved. Remove from heat and allow brine to cool to room temperature.
03 - Layer the drained vegetables, chilies, garlic slices, and peppercorns into a clean 1-quart glass jar, packing tightly to minimize air pockets.
04 - Pour the cooled brine over the vegetables, ensuring all pieces are completely submerged. Seal jar tightly with lid.
05 - Refrigerate for at least 2 hours before serving. For optimal flavor development, marinate overnight. Properly stored, these pickles will keep for up to 2 weeks.