Avocado Salad Flatbread Sandwich - California Avocados

Ingredients

• 2 Tbsp. white wine vinegar, divided
• 1/4 tsp. finely chopped fresh garlic
• As needed Salt and freshly ground black pepper, to taste
• 3 Tbsp. olive oil
• 1/3 cup chopped sweet onion
• 1/3 cup diced tomato
• 2 ripe, Fresh California Avocados, peeled, seeded and diced
• 4 (about 7-inch diameter) flatbread rounds, such as pita
• As needed Hearts of romaine leaves – as needed
• 2 oz. shaved romano cheese** Jack or fontina cheese slices may be substituted