Creamy Roasted Tomato Basil Soup

| 2 1/2 lbs Roma tomatoes (, halved lengthwise)

| 1 1/4 lbs Grape ((or Cherry) tomatoes, halved lengthwise)

whole cloves garlic (, peeled and smashed with the back of a knife)

olive oil

Salt and freshly ground black pepper

large yellow onion, (chopped (optional))

red bell pepper ((capsicum), deseeded and diced)

potato ((100 g | 3 oz), diced)

tomato paste

vegetable broth

lightly packed fresh basil leaves (, roughly torn)