¼ Cup Grape Jelly 1 Small Can Wet Cat Food 1 Teaspoon Boric AcidDirections: Mix all three ingredients together. Place small spoonfuls of the cat food near foraging ants and cockroaches. In the case of ants; not only will they eat the deadly poison, but will also bring some back for the Queen ant to munch on. If baited successfully, the ants in the nest should be exterminated within a couple days. The cockroaches will also die after ingesting the boric acid laced cat food.