Recipes: Grilled summer squash with lemon-scallion dressing

Preparation:    Preparation time: 10 mins Cooking time: 25 mins Serving: 8 Ingredients: Canola oil for grill grates 3 small zucchini (about 1 pound), halved lengthwise 3 small yellow squash (about 1 pound), halved lengthwise 2 tbsp. olive oil, divided Kosher salt and freshly ground black pepper 1/2 tsp. lemon zest, plus 1/2 a whole lemon...