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Steam the potato (fork tender) and the green beans (until crisp-tender).
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Hard-boil the egg.
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Cut cherry tomatoes in four, season them with a drizzle of olive oil and a pinch of salt.
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Drain the tuna filets.
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Make the dressing: blend vinegar, olive oil, shallot, mustard, thyme, 1/2 teaspoon salt, and pepper to taste, until creamy.
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Peel and slice the egg in 4-5. Peel and coarsely dice the potato.
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Toss the potato with a tablespoon of the dressing.
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Assembly the salad: place endive as a base, add the green beans, the tomatoes, the egg, the tuna filets and the potato. Finally season with the remaining dressing.