Homemade tomato soup Halve 1.5kg tomatoes, place cut side up on a lined baking sheet, lightly salt, and roast at 450f for 45 minutes. Dice and sautee a medium yellow onion and one clove of garlic (only one clove - temper yourselves, garlic lovers, trust me) Puree tomatos and onions in a blender with 500mL heavy cream (35%) and a few leaves of fresh basil. The result will be very thick. You can thin it out with either chicken/vegetable stock or more cream. Bring it back up to temp in a saucepan and serve with grilled cheese