Mediterranean barbecued zucchini with garden salsa

Ingredients

• 4 to 6 large plum tomatoes
• 2 garlic cloves
• 2 green onions
• 1/4 cup chopped fresh basil leaves , or 1 to 2 tsp dried leaf basil
• 2 tbsp capers , coarsely chopped (optional)
• 1 tbsp red wine vinegar
• 1 tbsp granulated sugar
• 1/2 tsp dried dill
• 1/4 tsp salt
• 1/4 tsp freshly ground black pepper
• 1 tbsp olive oil
• generous pinch salt
• generous pinch pepper