Dice the onion and sauté in the heated oil. Add the tomatoes and bring to the boil. Stir in the ginger and season with vegetable stock, pepper and salt.
Let simmer for about 10 minutes.
In the meantime, roast the chopped pine nuts in a pan without oil.
Spread the finished soup on soup plates or in soup bowls. Garnish with the pine nuts and basil and serve.