Lemon Butter Sauce for Fish

This was the first way I learned to cook fish. My favorite fish for this is tilipia, but any white fish filets would work. It is perfect with rice and a green vegetable. I found a website that has a picture of the Knorr seasoning (it doesn't seem to have Swiss in the name anymore). You can see a picture of it here: http://www.germandeli.com/048001704022.html