I'm aware that this is unorthodox, so don't come after me, Garlic Police. I like garlic in my guac, and I don't like tomatoes in it. I never said this was the ultimate, handed down from Quetzalcoatl, holiest of holies traditional Mexican version. This is just the way I like it. If you want to use vinegar instead of lime juice, white wine vinegar or red wine vinegar both work well.