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Wash and dry all produce. Halve and peel shallot; thinly slice half the shallot and mince remaining. Fill a small bowl with cold water; add sliced shallot and let soak. (TIP: This helps mellow its sharp bite.) Quarter tomatoes. Trim and dice cucumber. Zest and quarter lemon (quarter both lemons for 4 servings). Pick and finely chop fronds from dill.