Caramelized Onion Sweet Potato Salad

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2 tablespoons olive oil

3 red onions, peeled, halved and thinly sliced

1 tablespoon Dijon mustard

1/4 cup balsamic vinegar

1 teaspoon honey

1 tablespoon finely chopped orange zest

1 tablespoon finely chopped fresh thyme

3 sweet potatoes, sliced into 1/2-thick slices

Vegetable oil

Salt and freshly ground pepper