Using a sharp knife, score bottom of each tomato with an X; transfer to a bowl. Bring a kettle of water to a boil; pour water over tomatoes. Let stand 30 seconds; drain tomatoes and run under cold water. Cool. Peel tomatoes.
In a shallow dish, whisk together vodka, lemon juice, and sugar. Toss with tomatoes. Cover and refrigerate (30-60 minutes).
Stir together last 3 ingredients; sprinkle tomatoes with lemon salt and serve.