Tomato and Watermelon Salad

2 tbsps balsamic vinegar 1 tbsp fresh lemon juice 1/2 cup extra virgin oil seal salt and freshly ground pepper 1 pint cherry tomatoes 2 beefsteak or other large tomatoes 1 o 2 tsp superfine or granulated sugar 1 tbsp chopped fresh tarragon 4 strawberries, hulled and cut into small pieces 1 cup cubed watermelon…