Heirloom Tomato Salad with Buttermilk Dressing and Blue Cheese

Name: Heirloom Tomato Salad with Buttermilk Dressing and Blue Cheese
Ingredients: 1/2 cup mayonnaise; 1/4 cup buttermilk; 2 tablespoons finely chopped fresh Italian parsley; 1 1/2 tablespoons fresh lemon juice; 1 1/2 tablespoons minced shallot; 1 small garlic clove, minced; Coarse kosher salt; 6 assorted large heirloom tomatoes, cored, cut into 3/4-inch-thick wedges; 1/2 cup thinly sliced shallots; 2 tablespoons extra-virgin olive oil; 1 tablespoon fresh lemon juice; 3/4 cup crumbled blue cheese; 2 green onions, thinly sliced diagonally; 2 tablespoons fresh Italian parsley leaves