Open-Faced Steak, Pear, and Gorgonzola Sandwiches

Ingredients

• Coking spray
• 1 lb flank steak, trimmed
• 1/2 tsp salt
• 1/2 tsp freshly ground black pepper
• 1 cup thinly sliced red onion, separated into rings (about 1/2
• 2 small Bartlett pears
• 3 tbsp bottled lemon juice, divided
• 2 tbsp white wine vinegar
• 1 tbsp water
• 1 tsp olive oil
• 1 tsp bottled minced garlic
• 6 cups prewashed gourmet salad greens
• 1/4 cup (1 ounce) crumbled Gorgonzola cheese
• 6 (2.8-ounce) Mediterranean-style white flatbread