Serves 1-2 depending on portion size
1 tablespoon oil
2 cloves garlic
1.5 teaspoons basil, fresh or dried, divided
3 cups tomato sauce/passata
1/2 teaspoon parmesan dust (optional)
1 tablespoon cream
(OR 1 tablespoon milk with 1 pinch baking soda)
Finely dice the onion and garlic and fry over a medium heat in oil. After a minute, add about half a teaspoon of basil and stir to coat. Continue cooking the onions over a low flame for ten minutes to caramelize them, adding extra oniony flavour.
Add the tomato sauce, along with more basil, parmesan (if desired) and seasoning. Simmer until reduced as much as you would like it to.
Blend to the desired consistency and return to the pan. (At this point you can freeze it, according to BBC Good Food.)
If you are using baking soda and milk, put the baking soda into a bowl and pour the milk over it. Mix together with a fork to get rid of the lumps, and add it to the soup over a high heat. Ignore the foaming, it will go away. Reduce the heat to a simmer and bubble away until the foam dissipates.
Alternately, add the tablespoon of cream to the blended soup and stir through. Warm.
Serve with grilled cheese on toast.