Grilled Portobello Burger with Onion Jam

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2/3 cup low-fat plain yogurt

3 tablespoons prepared horseradish

4 tablespoons extra-virgin olive oil

3 medium-large red onions, thinly sliced (about 2 pounds)

2 sprigs fresh thyme

Kosher salt and freshly ground black pepper

1 cup red wine

1/4 cup honey

1/4 cup red wine vinegar

1 garlic clove, crushed

2 tablespoons balsamic vinegar

4 large portobello mushrooms, (about 1 pound) stemmed

Lettuce leaves

4 whole grain buns, or whole wheat English muffins, split and toasted