Preparation Whisk 1/2 cup oil, thyme, and black pepper in small bowl to blend. Arrange grape leaves, vein side up, on work surface. Dip each cheese round into thyme oil and place in center of 1 grape leaf. Fold sides of leaves over cheese; fold up bottom and continue to roll up, enclosing cheese completely. Arrange wrapped cheeses, seam side down, on platter. Brush lightly with some thyme oil. Cover and chill at least 1 hour. (Can be made 1 day ahead; keep chilled. Cover remaining thyme oil and store at room temperature.) Prepare barbecue (medium-high heat). Whisk 1/4 cup extra-virgin olive oil, vinegar, and mustard in small bowl to blend. Season dressing with salt and pepper. Slightly overlap tomato slices on large platter. Drizzle with dressing; sprinkle with half of olives. Place wrapped cheese rounds on grill, seam side down. Grill until cheese softens and leaves begin to char, about 2 minutes per side. Arrange cheeses atop tomatoes. Sprinkle with remaining olives. Brush bread slices with remaining thyme oil. Grill bread until beginning to brown, turning occasionally, about 5 minutes. Cut toasts diagonally in half. Serve cheese, passing toasts separately.
Preparation Whisk 1/2 cup oil, thyme, and black pepper in small bowl to blend. Arrange grape leaves, vein side up, on work surface. Dip each cheese round into thyme oil and place in center of 1 grape leaf. Fold sides of leaves over cheese; fold up bottom and continue to roll up, enclosing cheese completely. Arrange wrapped cheeses, seam side down, on platter. Brush lightly with some thyme oil. Cover and chill at least 1 hour. (Can be made 1 day ahead; keep chilled. Cover remaining thyme oil and store at room temperature.) Prepare barbecue (medium-high heat). Whisk 1/4 cup extra-virgin olive oil, vinegar, and mustard in small bowl to blend. Season dressing with salt and pepper. Slightly overlap tomato slices on large platter. Drizzle with dressing; sprinkle with half of olives. Place wrapped cheese rounds on grill, seam side down. Grill until cheese softens and leaves begin to char, about 2 minutes per side. Arrange cheeses atop tomatoes. Sprinkle with remaining olives. Brush bread slices with remaining thyme oil. Grill bread until beginning to brown, turning occasionally, about 5 minutes. Cut toasts diagonally in half. Serve cheese, passing toasts separately.