Rachael's Pork Paillard With Warm Winter Greens Salad – Rachael Ray

Ingredients

• 1 small red onion or 2 large shallots, peeled and thinly sliced into rings
• ¼ cup white wine vinegar
• ¼ cup water
• 1 tablespoon sugar
• 1 teaspoon salt
• 1 teaspoon yellow mustard seed
• 1 teaspoon coriander