geeme said:FIFY
Tomatillos are related to tomatoes. Have a different flavor - more tart, IMO - but many people do put tomatoes in their guac, either instead of tomatillos or in addition to them. I almost always include jalapeno rings (or chopped), too. And fresh cilantro. Maybe a touch of cumin......
Pretty darn close to my take on it... avocados, jals, garlic, cilantro, lime juice and cumin (s&p of course). I also add a couple of tablespoons of sour cream. It smooths out the guac and I think combined with the lime juice it really helps with the oxidation.