For a nice smoke flavor, you want to use wood smoking chips. The heat will stay lower taking more time to grill, giving you that wonderful smoky flavor. Soak half of a bag, approximately 100 cubic inches, of wood chips in water for 30 minutes.
Start a charcoal grill preheating the coals.
Place the potatoes in a microwave-safe bowl and microwave for 5-8 minutes.
Brush the sliced side of the potatoes and onions with olive oil.
Spread out hot charcoal. Drain water from the chips and spread on top of the charcoal.
Place potatoes and onions on grate cut side down and grill for 10 – 15 minutes, or until the potatoes are tender but not soft. Think al dente. You want them to have some firmness that will hold up to being cut and tossed without falling apart.
Remove the potatoes from the grill and wrap in foil. Place in refrigerator for 30 minutes to stop the cooking process. Remove the onions and set aside until later.
Remove from the refrigerator and cut the potatoes into bite-sized cubes and place in a large bowl. Dice the onions and add to the bowl. Add celery, bell peppers, mayonnaise, yogurt, smoked paprika, salt, and pepper. Gently mix together.
Refrigerate until ready to serve allowing the flavors to marry. Serve with your favorite grilled meats