1. A cold dish. Made from ingredients such as green peppers, cilantro and green onions, it is called tiger dish because the refreshingly hot flavor activates one's appetite and is as fierce as a tiger.
2. A metaphor. In the Northeastern dialect, Tiger Vegetable is often used to describe someone who is stupid and lacks heart.
So, the meaning of the tiger vegetable taint may be that someone is as stupid and heartless as a tiger. However, the exact context may vary as to whether the tiger dish refers to gazpacho or a metaphor for stupidity and lack of heart.