Onion Tarts with Mixed Greens

INGREDIENTS

• 2 rolled-out rounds savory tart dough, each 12 inches in diameter (see
• related recipe at left)
• 5 Tbs. olive oil
• 4 yellow onions, thinly sliced
• Salt and freshly ground pepper, to taste
• 3 garlic cloves, minced
• 2 tsp. minced fresh thyme
• 2 Tbs. minced fresh flat-leaf parsley
• 4 tsp. balsamic vinegar
• 1 egg, lightly beaten
• 4 oz. mixed salad greens
• 2 oz. goat cheese, crumbled