How to Make It
Preheat the oven to 350°. Arrange the baguette slices on a baking sheet. Brush the tops with oil and season with salt. Toast until golden and crisp, about 8 minutes. Transfer to a serving platter and let cool slightly.
Spread 1 teaspoon of mayonnaise on each toast, then top with a few slices of apple. Top with the tuna and garnish with parsley leaves. Drizzle with olive oil.