1 medium tomato, sliced
1 small onion, slice thin
3 tablespoon white vinegar
1/3 teaspoon sugar
dash of ground black pepper
1/2 teaspoon rock salt
Combine vinegar, sugar and ground pepper. Mix well and set aside.
Slice daikon radish the thinnest crosswise and place in a bowl. Sprinkle rock salt and mix. Let it sit for 30 minutes, rinse in running water and drain excess water.
Combine radish, onion and tomato. Pour in vinegar mixture and mix well.
Refrigerate for at least an hour before serving with your favorite fried fish or meat.