Grilled Potato with vinaigrette

1/2 pound green beans 8 ounces, or wax beans, or purple beans, ends trimmed 1 pound new potatoes halved 1 x salt to taste * 3 tablespoons red wine vinegar 1[...]

2 x Idaho baking potatoes , like russets peeled, sliced     into 12 pcs about 1/2"-thk, and     punched out with round cookie cutter 3 sm purple baking[...]

3 tablespoons fresh lemon juice 2 tablespoons minced shallot 1 tablespoon plus 2 teaspoons chopped fresh marjoram 1 teaspoon finely grated lemon peel 1/4 cup[...]