Begin by lightly toasting your preferred bread slices in a toaster or on a skillet over medium heat for about 2-3 minutes until they are golden brown and crispy.

While the bread is toasting, scoop out the ripe avocado into a medium bowl. Mash it with a fork and stir in the lemon juice, salt, and pepper to taste until you achieve a creamy consistency.

Once your bread is toasted, evenly spread the mashed avocado over one side of each slice.

Next, take a medium cucumber and slice it thinly, aiming for about 1/8-inch thick slices for optimal crunch. Layer the cucumber slices on top of the avocado spread.

On top of the cucumber, add a handful of fresh leafy greens, followed by the thinly sliced red onion and halved cherry tomatoes if you're using them. Sprinkle fresh herbs over the top.

To amp up the flavor, drizzle a teaspoon of olive oil over your layered vegetables or apply your favorite sandwich spread.

Finally, place the second slice of bread on top to complete the sandwich. Give it a gentle press to hold everything together, then carefully cut the sandwich in half.