All quantities are approximate - add more or less to taste: This mixture feeds 4 - 6 people as an appetizer.
2 - 3 ripe avocados cut into good sized chunks (they'll get somewhat smushed when you stir everything together, so start with chunks)
1/2 teaspoon coarse salt
1 Tablespoon finely chopped onion
1 Tablespoon finely chopped cilantro
1 finely chopped good-sized jalapeno, seeds and white pith removed
2 Tablespoons diced tomato (I cut grape tomatoes into quarters)
1 lime, juiced
If at all possible, you should do this in a molcajete made of lava stone or unpolished granite - the rough interior is really good for grinding the ingredients together and you can serve in it. If you don't have one, use a shallow bowl and a small amount of coarse salt and smear everything together with a fork.
Grind together the garlic, salt, onion, and cilantro and jalapeno. Start grinding (or smearing) so that approximately 1/4 of this mixture is smushed and the remaining 3/4 is still in its chopped condition.
Fold (gently) the chopped avocado and chopped tomatoes into this mixture. Squeeze lime juice over the whole thing.
That's it - serve with tortilla chips!