Core 1 1/2 pounds small green tomatoes and cut into wedges. Bring 2 cups water and 1/2 cup white wine vinegar to a boil in a saucepan. Add the tomatoes in batches and cook until crisp-tender, about 3 minutes; drain and let cool. Whisk 1/4 cup each white wine vinegar, olive oil, chopped parsley and chopped mint and 1 tablespoon each kosher salt, sugar and minced Fresno chile in a large bowl. Add the tomatoes and toss. Refrigerate at least 4 hours or overnight.