Roast the garlic and habanero pepper on a comal or griddle over medium heat until the garlic is soft and lightly browned, and the habanero is charred all around.
Peel the garlic and grind it into a paste along with the habanero and a pinch of salt in a molcajete.
Scoop the avocado flesh into the molcajete and mash until it's chunky.
Mix in the diced tomato, onion, cilantro, lime juice and salt to taste until everything is evenly distributed.