The Ultimate Sardine Avocado Caper Toast

1. In a small bowl, mash the avocado with the olive oil from the sardine tin, lemon juice, shallots, salt, and pepper until creamy. 
2. Spread the avocado mixture evenly onto a slice of sourdough bread. 
3. Top the toast with sardines, capers, additional lemon juice, extra shallots, flaky salt, and a sprinkle of pepper.