Wash the cucumber and trim the narrow ends. Score the skin evenly around lengthwise with a zester.

Cut cucumber horizontally into 1 ½" slices. Gently make a hollow in the cucumber with a teaspoon measuring spoon. Be careful not to break through the bottom or your filling will fall out.

Mix the tuna, mayonnaise and gherkins together. Salt and pepper to taste.

Pack tuna into the hollow and mound over the cucumber surface.

Slice reserved gherkins into thin horizontal slices. Top each tuna mound with a gherkin slice.

Garnish with paprika, minced green onion. Finish with a pinch of sea salt.