Peel the potatoes, cut into bite-size chunks, rinse and add to the pan.

Cut them into bite-size chunks, trying to keep them all roughly the same size.

Peel the sweet potatoes and chop into bite-size chunks.

Cut the fish into big bite-size chunks and season with salt and pepper.

Slice the tuna steaks into thick, bite-size chunks, arrange on top of the salad and serve.