Make the dressing: Combine the lemon juice, balsamic vinegar, salt and pepper in a small bowl and whisk to combine. Add more salt and pepper to taste. Slowly pour in the olive oil while whisking until the dressing thickens slightly and is emulsified.
Assemble the salad: Combine the tomato, avocado, and cucumber in a medium bowl and pour over the dressing. Toss the salad gently to coat all the vegetables evenly and serve.
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