I feed cucumber (with the 'cuke' or 'squishy middle part' as I call it, taken out to make less mess), potatoe, lettuce, and market shrimp.
To prepare the veggies, I just rinse them, cut them into four large pieces, then rubberband them to different parts of the driftwood, and for potatoes, I just drop them in different spots (they sink).
Shrimp is defrosted and rinsed, then dropped in the tank.
I don't use silverware because I don't like the look of a fork sitting in my tank and I worry about the plecs hurting their bellies if they're munching in the wrong position.