Begin by draining the tuna thoroughly in a fine mesh strainer.

Slice your avocado in half, remove the pit, and scoop the flesh into a mixing bowl. Mash the avocado gently until it’s creamy but still retains some texture.

Add the drained tuna to the bowl with the mashed avocado and gently fold them together.

Fold in the raisins until evenly distributed throughout the mixture.

Prepare the Bibb lettuce leaves on a serving platter, and spoon the tuna mixture into the center of each leaf.

Top each filled lettuce cup with shredded carrots and julienned cucumber before serving.