For the tomato fondue, melt the butter in a fondue pot, sauté the garlic in it.
Add tomato juice, paradeis pulp and sugar and bring to a boil. Remove from heat and sprinkle in cheese mixture. Slowly bring to a boil, stirring constantly until cheese is melted.
Add the cornstarch dissolved in the red wine, bring to a boil briefly. Add the grappa and season with salt, pepper, sugar and cayenne pepper and quickly serve the tomato fondue.