Tuna Rocket & Cucumber Squares is a refreshing and healthy appetizer that combines the flavors of tuna, rocket (arugula), and cucumber. The tuna is mixed with mayonnaise, lemon juice, and seasonings to create a creamy and tangy filling. The cucumber is sliced into squares and topped with the tuna mixture, creating a light and flavorful bite-sized snack. This dish is perfect for parties or as a light lunch option.