Grill the avocado halves on the grill for about 5 minutes until you get nice brown grill marks. Note that I didn’t say to peel the avocados. You want to grill with the peel on so it doesn’t fall apart on you.
Mash up avocados until your desired texture. I like my guacamole a bit chunky.
Squeeze lime over the avocados immediately or else it will start browning.
Toss in red onion, cilantro, grilled corn kernels and garlic.