Summer's best broccoli salad

Ingredients

• 1 garlic clove , or 1 tsp chopped bottled garlic
• 3 tbsp olive oil
• 2 tbsp freshly squeezed lemon juice
• 1 tsp dried oregano leaves
• 1/2 tsp hot red-chili flakes
• 1/4 tsp salt
• 1/4 tsp ground black pepper
• 1 large head broccoli
• 1 red or orange bell pepper
• 1/2 red onion
• 1/2 pint cherry tomatoes
• 1/3 cup freshly grated parmesan , or asiago (optional)