Grilled Artichokes with Yogurt-Dill Dipping Sauce

Name: Grilled Artichokes with Yogurt-Dill Dipping Sauce
Cook time: 30 minutes
Yield: Servings
Ingredients: Kosher salt; 1 lemon, halved; 4 large artichokes; 2 tablespoons olive oil; 1/2 cup low-fat Greek yogurt; 1 teaspoon chopped fresh dill