Low-Fat Veggie Pasta Sauce

This is probably the easiest pasta sauce I have ever had but stills packs a flavourful punch.

1 medium bell pepper (any colour), roughly chopped
1 medium carrot, roughly chopped
1 medium onion, roughly chopped
1 stick celery, roughly chopped
3 fresh tomatoes, roughly chopped
2 cloves garlic
1 tin tomatoes
1 vegetable stock cube
1 large courgette, sliced into rounds and quartered
1 tsp dried mixed herbs
1 tbsp chopped fresh parsley
1/2 tsp olive oil
Salt & Fresh black pepper to taste