Preheat the oven to 180ÂșC (fan) and prep the tomatoes by playing them on a baking tray, drizzle with olive oil, salt and pepper
Chop the very top off the garlic bulb, drizzle over olive oil, salt and pepper, wrap in tin foil and add to the baking tray with the tomatoes, pop in the oven for around 25 minutes
When the tomatoes have around 12 minutes left, add the spaghetti to boiling water with a generous pinch of salt and cook till al dente (around 8-10 mins)
Take the tomatoes and garlic from the oven, add them to a large pan with the tomato puree and harissa, remove two cloves from the garlic bulb and smash all of those ingredients together
Cook off those ingredients in the pan before adding a ladle of pasta water (around 150ml) followed by the cooked spaghetti then mix together
Add in the chopped fresh basil, garnish with salt and pepper and the toasted seeds and enjoy