01 - Fill a small saucepan with water and bring to a rolling boil. Gently lower the eggs into the water and boil for 8–10 minutes until fully set. Transfer immediately to an ice bath or cold running water to cool. Peel and slice into even rounds.
02 - While the eggs cook, toast the bread slices in a toaster or on a skillet until golden brown and crisp on the outside but still slightly tender inside.
03 - Halve the avocado, remove the pit, and scoop the flesh into a small bowl. Mash lightly with a fork, leaving some texture. Season with fresh lemon juice, sea salt, and black pepper to taste.
04 - Divide the mashed avocado evenly and spread a generous layer over each slice of toasted bread, pressing gently so it adheres to the surface.
05 - Slice the tomato into thin rounds and arrange them over the avocado spread. Top each toast with the sliced hard-boiled egg, distributing the pieces evenly.
06 - Finish with a sprinkle of chopped chives or parsley and red pepper flakes if desired. Serve immediately while the toast is still warm and crisp.