This is a perfect topping for our Pulled Pork Sandwiches.
Toss vegetables with 2 tablespoons salt in a large colander set over a bowl, and refrigerate for 1 hour. Rinse well, pat dry, and place vegetables in a clean glass jar or glass bowl. Bring remaining 2 tablespoons salt, the vinegar, sugar, peppercorns, mustard and coriander seeds to a simmer in a small saucepan over medium heat. Simmer for 5 minutes. Pour over vegetables, and let cool for 1 hour. Cover, and refrigerate overnight or up to 3 weeks.