Lightly brush one side of bread with olive oil and toast in a preheated cast iron pan or grill pan or outdoor grill fire. Brush exposed side of bread with remaining oil. Turn bread after a minute or so and lightly toast second side. Remove from pan and set aside to cool.
In a small bowl combine tomatoes, garlic, basil, vinegar, cannabis oil and stir to mix well. Season to taste with salt and pepper.
Divide the tomato mixture between the toasts and sprinkle with Parmesan, if using. Serve immediately.