Honestly, I think Bruce would have to resort to elaborate acts of self-sabotage to screw up a basic salad. Which is not to say he COULDN'T. I mean, I can see him putting together the basics of a salad, starting to add the dressing, then going 'hmm - this salad isn't quite... BATTY enough', and deciding to personalize it a bit. By the time he was done snipping the lettuce leaves into batwing shapes, cutting the Bat-symbol into all the cucumber slices, and carving little Batman faces into the cherry tomatoes, the actual salad itself would be a wreck.