Place everything on the ingredient list from tomato to the quartered red onion (keep the finely diced onion for later) in a roasting tray. Pour over a good drizzle of olive oil, season with salt and pepper, mix to coat and roast in the oven for 30-40 minutes, turning occasionally
When roasted, allow to cool for 5 minutes and peel, then chop/ mash up the ginger. Squeeze out the head of garlic and chop/ mash the soft delicious contents
Add the remaining oil to the large stock pot over a medium heat. Soften the chopped onion for 5 minutes or so, stirring frequently
Add the tomato puree and sugar and cook for 1-2 minutes, stirring constantly
Add the contents of the roasting tray to the stock pot. Use a little hot stock to de-glaze the roasting tray, add this and the rest of the stock to the pan and bring to a low simmer. Reduce heat to low
If you have the vines from the tomatoes, put them in the soup now. You will remove them before you blend the soup but they will help impart that floral tomato flavour to the finished soup. That delicious smell of tomatoes in a green house comes largely from the vines, not the tomatoes themselves
Partially cover and cook on a low heat for 25-30 minutes. Remove the vines and discard
Blend well with a stick blender (Or blender). Add cream and blend again briefly
Rip and add the basil leaves and season with salt and pepper to taste. Mix and cook on low for 5 minutes