2 large sweet onions cut into 1/2-inch slices
1/4 cup olive or vegetable oil
1/2 teaspoon salt
1/8 teaspoon pepper
1/2 cup plain yogurt
1 tablespoon mayonnaise
1/4 cup chopped radishes
2 tablespoons snipped fresh dill
Brush both sides of onion slices with oil; sprinkle with salt and pepper.
Place the onions directly on grill rack.
Grill, covered, over indirect heat for 8 minutes on each side or until crisp-tender.
In a small bowl, combine the yogurt, mayonnaise, radishes and dill.
Serve with the onions.