Baked Parmesan Tomatoes - Perfect side dish that goes with anything

Ingredients

• 4 Tomatoes - halved horizontally
• 1 ½ tbsp Extra Virgin Olive Oil
• ½ cup Parmesan - freshly grated
• 1 tbsp Balsamic Vinegar
• 2 tbsp Onion - finely chopped
• 1 tsp Oregano
• Salt
• Pepper