You can buy butter salted or unsalted. The fun part is customizing butter. A great start is to raost a head of garlic on the grill with your fave wood for about 45 minutes. Extract the now succulently smoky meat from the cloves into a bowl. Mash 1 stick of room temperature butter (not margarine, real stuff) in with the smoked garlic. From there you can experiment and add your favorite spices but this is a good base. I would also reccomend you start with unsalted butter and add kosher salt to taste so you control the flavor entirely. spread it on homemade bread and grill for some awesome grilled garlic bread, dollop on steak, brush on vegies, whatever. Its magic stuff
And if I had my way, I'd give a coconut to everyone.