1: Boil the potatoes until soft, then let them cool and dice them.
2: Grill the zucchini and cut into slices.
3: In a bowl, combine boiled potatoes, grilled zucchini, and tuna.
4: Add chopped parsley, lemon zest, lemon juice, and drizzle with olive oil.
5: Season with salt and toss to mix well.
