Heat the frying pan, and melt the butter. After half a minute add green onion rings and crushed garlic. Meanwhile, season the tuna steaks with salt, pepper and lemon juice (don't trow away the squeezed lemon). Add the chopped capers to the frying pan, mix everything and add the tuna steaks with the squeezed lemon. Fry a few minutes from every side, when almost done add the chopped dill. The steaks are done when they are opaque. Serve with potatoes or a fresh salad.