If you don't have a powerful blender, you may need to soak your cashews in a bowl of hot water for several hours or boil for 10 minutes. Drain and then proceed.
Preheat an oven to 425°F and line a pan with parchment paper. Halve the tomatoes and add to the pan with the cut side facing up. Season with salt and pepper. Bake for 15-20 minutes until juicy and bursting.
Begin cooking your pasta of choice while the tomatoes are roasting.
Add all of the "sauce" ingredients to a high-powered blender and blend until 100% smooth and no bits of nuts remain.
Taste and add any additional seasoning, if desired. Pour the sauce over cooked pasta and top with the tomatoes. Garnish with extra chopped basil.