If using fresh tomatoes, slice tomatoes and puree them in a food processor. Strain the seeds to make tomato juice.
In a large pot, mix together tomato juice, large ginger slices, Sriracha, sugar, coconut milk, curry powder, salt and wasabi powder. Simmer on medium heat for 10 minutes.
Remove ginger slices and chill bloody mary mix for at least one hour.
Add vodka to chilled bloody mary mix and top with garnishes.