Grilled Portobello Burger with Onion Jam

Ingredients

• 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

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