In a small bowl, mix cubed Persian cucumber with olive oil, chopped dill, and a tiny pinch of salt. Stir gently and set aside.
Cube the avocado and toss it with lemon juice and freshly cracked black pepper. Keep the cubes intact.
Using a round mold (or cleaned tuna can with the bottom removed), press the cucumber layer gently into the base.
Add the avocado layer on top, tapping the mold lightly so it settles evenly.
Finish with a layer of smoked salmon - either folded decoratively or laid flat.
In a small bowl, whisk together olive oil, lemon juice, lemon zest, chopped cherry tomatoes, and dried capers. Add salt and pepper to taste.
Spoon the dressing generously over the top of the salad.
Carefully lift the mold straight up to reveal clean layers.
Serve immediately for the freshest flavor and texture.