I use canned tomatoes for my pico de gallo.. and..
A pile of minced garlic(at least a head per can o' tomatoes), a diced Spanish onion, a bunch of cilantro, juice from a few limes, a few chopped chili peppers, a bit of chili powder, salt.
Needs to sit at least an hour, (overnight is best) also needs draining.
No vampire problems at my house.