Heat Grill to high.
Place shrimp in large bowl, season with salt, pepper and cumin. Toss to coat evenly.
Divide the shrimp among 6 skewers and do not crowd.
Place onion in grill pan and grill.
Lightly oil grill grates.
Grill shrimp for 2 minutes per side; onions for about 5 minutes per side.
Chop red onions and place in medium bowl; stir in the celery, tomatoes, chipolte pepper and garlic. Season with salt and black pepper. Set aside.
In small bowl, toss avocado with lime juice.
In another small bowl, stir together the sour cream and cilantro.
Serve shrimp, red onion salsa, avocado and sour cream on table with shells/tortilla.
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