– Place tomato, pepper, and garlic on a hot griddle to roast. Turn to roast evenly. Remove garlic clove promptly, since it roasts sooner and if burnt, will taste bitter. This step will take about 8 minutes until the tomato is soft and the skins are peeling out.
– Grind the garlic clove until it forms a paste. Cut the tomato and pepper into small cubes to fit the mortar and for easy grinding. Add the pepper to the mortar and proceed to grind. Continue with the roasted tomato, skins removed. Keep grinding until you have a nice salsa. You can grind to the texture of your liking, either coarse or very fine.
– Season with salt and stir in the chopped onion, cilantro, and diced avocado.