What is a wasps favourite food?

Answer 1

Diet

Generally wasps are parasites as larvae, and feed only on nectar as adults. Some wasps are omnivorous but this is relatively uncommon, they feed on a variety of fallen fruit, nectar and carrion. Many wasps are predatory, preying on other insects. Certain social wasp species, such as yellowjackets, scavenge for dead insects to provide for their young. In turn the brood provides sweet secretions for the adults.

In parasitic species the first meals are almost always provided from the animal the adult wasp used as a host for its young. Adult male wasps sometimes visit flowers to obtain nectar to feed on in much the same manner as honey bees. Occasionally, some species, such as yellow jackets, invade honeybee nests and steal honey and/or brood.

Source: http://www.answers.com/wasps+?gwp=11&ver=2.3.0.609&method=3