Step 1

Preheat oven to 400°F. Toss red peppers, tomatoes and garlic with sunflower oil, salt and pepper. Place in a single layer on a large sheet pan and roast for about 20 minutes, stirring twice.

Step 2

Add walnuts to the mixture and roast for 10 minutes more. Let cool for at least 20 minutes

Step 3

Place pepper mixture In a large food processor with all remaining ingredients except olive oil. Add the oil slowly while food processor is running, processing until smooth.