Wilted Spinach Salad w/ Balsamic Caramelized Red Onions

INGREDIENTS

• 2 tablespoons balsamic vinegar
• 2 tablespoons e.v. olive oil
• extra olive oil for drizzling
• juice of ½ small lemon (a little over a tablespoon)
• 1 small package organic baby spinach
• 1 large red onion – sliced thin
• ½ teaspoon sea salt
• ½ teaspoon fresh ground pepper