The problem with cooking garlic is that unless you are carefull you can burn it which makes it taste bitter. I also like the idea of marinating it in vodka, it allows the flavors to develop. I prefer to crush the garlic with the side of a knife before dicing, it helps release the oils better than just slicing it. Another thing you can try is after crushing it with the knife, put a pinch of sea salt on the garlig and draw the side of the knife over it, this turns the garlic into a paste.