Remove the pit from and scoop out the flesh into a bowl. Mash with a fork until it’s the desired consistency. Mix in a pinch of salt and pepper and the lemon juice.
Spread the avocado mixture on the toast. Slice the hard boiled egg and place on toast. Slice the tomatoes in half and arrange on the toast. Sprinkle with a little more salt, if desired.
Notes
I like to use Dave's Killer Bread Thin-Sliced Organic Sprouted Whole Grain Bread, but any whole grain bread is fine.