1) Remove pitt from avocado and add to two slices of thick bread. Mash onto bread like a spread. Use 1/2 an avocado per bread slice.
2) Top each half of bread with a few sardines, roughly chopped.
3) Top each sandwich with slivered red onion, capers, a drizzle of olive oil, and some fresh black pepper.
4) Bake sandwiches at 425 for 5-6 minutes or broil for 2 minutes.
5) Serve immediately!