Slice the cucumber into even rounds and set aside.
In a food processor, combine olives, capers, garlic, olive oil, lemon juice, and herbs (if using). Pulse until it forms a coarse paste. Add more oil if needed to reach your desired consistency.
Spoon about a teaspoon of the tapenade onto each cucumber slice.
Garnish with a sprinkle of lemon zest, cracked pepper, or fresh herbs.
Serve immediately or refrigerate until ready to enjoy.