01 - Fill a small saucepan with water and bring to a rolling boil. Gently lower the eggs into the water and cook for 8 to 10 minutes until hard-boiled. Transfer the eggs to a bowl of cold water to cool, then peel and slice into rounds.
02 - While the eggs cook, place the bread slices in a toaster and toast until golden brown and crisp on the edges.
03 - Halve the avocado and remove the pit. Scoop the flesh into a small bowl and 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 it across both toasted bread slices, pressing gently to adhere.
05 - Slice the tomato thinly and arrange the slices over the avocado layer. Top each toast with the sliced hard-boiled egg rounds.
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.