Combine all ingredients in a bowl until just mixed. Form into 4 patties, throw ‘em in a pan or on the grill (I used the good old George Foreman) and cook for 4–5 minutes on each side. Be careful not to overcook, as the burgers will get dry.
TO MAKE THE SPICY LIME MAYO:
Combine all ingredients in a small bowl and mix with a fork until smooth.
Serve the burgers on whole-wheat buns with the mayo spread on top.