1) Place all the ingredients except the red peppers, extra two tablespoons of olive oil and croutons in a large bowl and mix together.
2) Heat the remaining two tablespoons of olive oil in a frying pan and fry the peppers for two minutes. Remove from the heat and add to the rest of the ingredients.
3) Leave to marinate for one hour then blend in a food processor. Serve chilled with the garlic croutons and reserved shredded basil sprinkled on top.