Cook the aromatics in a small sauce pan over low heat until the onion is soft and clear. Set aside and let them cool.
Once cooled, add the lime zest and cilantro to the aromatics. Stir and set aside.
Mix all the burger ingredients together in a large mixing bowl, including the cooled aromatics.
Patty into 8 quarter pound burgers and rest in the refrigerator for 1-2 hours. This step is important so the burgers don't fall apart while grilling.
When ready to grill, turn flame to medium and heat a cast iron griddle.
Place burgers on grill and cook on one side for 4 minutes. Then flip and cook on the other side until cooked through, another 4-6 minutes with the cover closed.
Let burgers rest 5 minutes before eating.