Grilled Gazpacho Salad with Shrimp

Name: Grilled Gazpacho Salad with Shrimp
Ingredients: 1 1 pound sweet onion (such as Vidalia or Maui), cut into 1/2 inch thick slices; 1 1/2 large English hothouse cucumbers, peeled, halved lengthwise; 1 1/2 pounds uncooked large shrimp, deveined but with shells intact*; 1 red bell pepper, quartered, cored; 1 yellow bell pepper, quartered, cored; 1/2 cup thinly sliced fresh basil; 1/4 cup red wine vinegar; 2 6x3x1 inch slices country style bread; 2 bunches green onions; root ends trimmed, onions left whole; 2 cups grape tomatoes, halved (about 1 pint); 2 medium heads of garlic, separated into cloves, peeled (about 24 cloves); 3/4 cup olive oil, divided; 8 firm plum tomatoes, halved lengthwise; Lime wedges