Toast the bread slices until crispy and golden brown.

While the bread is toasting slice the avocado in half, remove the seed, scoop out the flesh into a bowl, and mash it with a fork. Add the lemon juice and salt to taste. Mix well.

When the toast is ready, spread the mashed avocado evenly across toast, then top with tomatoes and Feta cheese. Sprinkle with black pepper and serve immediately.