I have a craving for roasted tomato soup. Does anyone have a recipe?

I thought maybe I could so the following:

Buy a bag of tomatoes (say 1 kg)
Cut in half
Roast until soft
Peel off skin
Roast some basil (I imagine it wouldn't take long)
Throw tomatoes & basil in slow cooker with salt and pepper
Cook for X? hours

Would that work? Do you think I should add garlic or onion? or worchestershire sauce?

I'm not an expert on the slow cooker - I've used it maybe twice (it's 6.5L in size). How long would I need to cook it for? And should I use 2kg? There's just DH & I atm, but I would freeze some

Then i could serve with hot buttered rolls..hmmm