I use a food processor to mix this.  I first put the 2 cans of petite diced tomatoes in and pulse.  (My husband and I don't large large chunks of tomatoes.  You could skip this step if you like larger chunks of tomatoes.) I also add serranos, jalapenos and habaneros.  I have added 2 serranos and 2 jalapenos and another time I have added 5 habaneros.  I like to change things up for my husband.  After I pulse the tomatoes, I place them in a bowl with a lid.  Then I add all the rest of the ingredients to the food processor and pulse.  I add this mixture to the tomato mixture and stir.  I place the bowl in the refrigerator to soak up the flavors.  I usually let it set for at least 2 hours before serving.