A good place to do this is Garden Grove. In the cave with wall paintings in, next to the log bridge with two fryders in it. Drop your snak trap that looks like a barrel in the center of the two fryders paths. Use your slingshot to hit the snak trap with ketchup which will lure the the fryders to it. Select your snak trap again and wait for both fryders to walk inside the catchment area and press right trigger (R2) to snag both at the same time and this trophy.