Roast the seeds in a pan without fat until golden brown. Take them out and let them cool down. Drain the mozzarella. Finely dice mozzarella and tomatoes. Wash and drain the basil. Put aside some of the tomatoes, pine nuts and basil for garnishing.
Finely chop the rest of the basil and seeds. Peel garlic and chop finely.
Stir mascarpone and milk until smooth. Stir in mozzarella, tomatoes, basil, garlic and seeds. Season to taste. Arrange cream and garnish with tomatoes, seeds and basil. Keep cool until serving.