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Whisk oil, lemon juice, mustard, honey, pepper, and 1 tsp. kosher salt in a medium bowl; set dressing aside.
Bring a medium pot of salted water to a boil. Carefully add eggs and cook 7 minutes. Using a slotted spoon, transfer eggs to a bowl of ice water (keep pot over high heat); chill until cold, about 5 minutes. Peel; set aside.
Meanwhile, add green beans and potatoes to the same pot of boiling water and cook until just tender, 2–4 minutes for green beans, 10–15 minutes for potatoes. Using a slotted spoon, transfer to bowl of ice water; let sit until cold, about 3 minutes. Transfer to paper towels; pat dry.
To serve, slice eggs in half and arrange on a platter with cooked and raw vegetables and tuna. Top with pickled-briny ingredient(s), sprinkle with sea salt, and drizzle some reserved dressing over. Serve with remaining dressing alongside.
Do Ahead: Dressing can be made 5 days ahead; cover and chill. Eggs can be boiled and vegetables blanched 2 days ahead; cover and chill separately.