Preparation Combine tomatoes, 4 tablespoons oil, olives, basil, capers, garlic, and shallot in medium bowl; stir to blend. Season salsa to taste with salt and pepper. Refrigerate at least 15 minutes and up to 2 hours. Prepare barbecue (medium-high heat). Brush salmon with remaining 2 tablespoons oil; sprinkle with salt and pepper. Grill salmon until just opaque in center, about 4 minutes per side. Transfer salmon to plates. Top with salsa.
Preparation Combine tomatoes, 4 tablespoons oil, olives, basil, capers, garlic, and shallot in medium bowl; stir to blend. Season salsa to taste with salt and pepper. Refrigerate at least 15 minutes and up to 2 hours. Prepare barbecue (medium-high heat). Brush salmon with remaining 2 tablespoons oil; sprinkle with salt and pepper. Grill salmon until just opaque in center, about 4 minutes per side. Transfer salmon to plates. Top with salsa.