01 - Fill a small saucepan with water and bring to a rolling boil over high heat. Gently lower the eggs into the water and cook for 8 to 10 minutes until hard-boiled. Transfer immediately to a bowl of ice 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 throughout.
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 it across both toasted bread slices, pressing gently to adhere.
05 - Slice the tomato into thin rounds and arrange over the avocado spread. Top each toast with the sliced hard-boiled egg halves.
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.